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Diffstat (limited to 'src/mscorlib/src/System/DateTime.cs')
-rw-r--r-- | src/mscorlib/src/System/DateTime.cs | 1360 |
1 files changed, 0 insertions, 1360 deletions
diff --git a/src/mscorlib/src/System/DateTime.cs b/src/mscorlib/src/System/DateTime.cs deleted file mode 100644 index 3de50336a9..0000000000 --- a/src/mscorlib/src/System/DateTime.cs +++ /dev/null @@ -1,1360 +0,0 @@ -// Licensed to the .NET Foundation under one or more agreements. -// The .NET Foundation licenses this file to you under the MIT license. -// See the LICENSE file in the project root for more information. - -namespace System { - - using System; - using System.Threading; - using System.Globalization; - using System.Runtime; - using System.Runtime.InteropServices; - using System.Runtime.CompilerServices; - using System.Runtime.Serialization; - using System.Runtime.Versioning; - using System.Security; - using System.Diagnostics.Contracts; - using CultureInfo = System.Globalization.CultureInfo; - using Calendar = System.Globalization.Calendar; - - // This value type represents a date and time. Every DateTime - // object has a private field (Ticks) of type Int64 that stores the - // date and time as the number of 100 nanosecond intervals since - // 12:00 AM January 1, year 1 A.D. in the proleptic Gregorian Calendar. - // - // Starting from V2.0, DateTime also stored some context about its time - // zone in the form of a 3-state value representing Unspecified, Utc or - // Local. This is stored in the two top bits of the 64-bit numeric value - // with the remainder of the bits storing the tick count. This information - // is only used during time zone conversions and is not part of the - // identity of the DateTime. Thus, operations like Compare and Equals - // ignore this state. This is to stay compatible with earlier behavior - // and performance characteristics and to avoid forcing people into dealing - // with the effects of daylight savings. Note, that this has little effect - // on how the DateTime works except in a context where its specific time - // zone is needed, such as during conversions and some parsing and formatting - // cases. - // - // There is also 4th state stored that is a special type of Local value that - // is used to avoid data loss when round-tripping between local and UTC time. - // See below for more information on this 4th state, although it is - // effectively hidden from most users, who just see the 3-state DateTimeKind - // enumeration. - // - // For compatibility, DateTime does not serialize the Kind data when used in - // binary serialization. - // - // For a description of various calendar issues, look at - // - // Calendar Studies web site, at - // http://serendipity.nofadz.com/hermetic/cal_stud.htm. - // - // - [StructLayout(LayoutKind.Auto)] - [Serializable] - public struct DateTime : IComparable, IFormattable, IConvertible, IComparable<DateTime>, IEquatable<DateTime>, ISerializable - { - - // Number of 100ns ticks per time unit - private const long TicksPerMillisecond = 10000; - private const long TicksPerSecond = TicksPerMillisecond * 1000; - private const long TicksPerMinute = TicksPerSecond * 60; - private const long TicksPerHour = TicksPerMinute * 60; - private const long TicksPerDay = TicksPerHour * 24; - - // Number of milliseconds per time unit - private const int MillisPerSecond = 1000; - private const int MillisPerMinute = MillisPerSecond * 60; - private const int MillisPerHour = MillisPerMinute * 60; - private const int MillisPerDay = MillisPerHour * 24; - - // Number of days in a non-leap year - private const int DaysPerYear = 365; - // Number of days in 4 years - private const int DaysPer4Years = DaysPerYear * 4 + 1; // 1461 - // Number of days in 100 years - private const int DaysPer100Years = DaysPer4Years * 25 - 1; // 36524 - // Number of days in 400 years - private const int DaysPer400Years = DaysPer100Years * 4 + 1; // 146097 - - // Number of days from 1/1/0001 to 12/31/1600 - private const int DaysTo1601 = DaysPer400Years * 4; // 584388 - // Number of days from 1/1/0001 to 12/30/1899 - private const int DaysTo1899 = DaysPer400Years * 4 + DaysPer100Years * 3 - 367; - // Number of days from 1/1/0001 to 12/31/1969 - internal const int DaysTo1970 = DaysPer400Years * 4 + DaysPer100Years * 3 + DaysPer4Years * 17 + DaysPerYear; // 719,162 - // Number of days from 1/1/0001 to 12/31/9999 - private const int DaysTo10000 = DaysPer400Years * 25 - 366; // 3652059 - - internal const long MinTicks = 0; - internal const long MaxTicks = DaysTo10000 * TicksPerDay - 1; - private const long MaxMillis = (long)DaysTo10000 * MillisPerDay; - - private const long FileTimeOffset = DaysTo1601 * TicksPerDay; - private const long DoubleDateOffset = DaysTo1899 * TicksPerDay; - // The minimum OA date is 0100/01/01 (Note it's year 100). - // The maximum OA date is 9999/12/31 - private const long OADateMinAsTicks = (DaysPer100Years - DaysPerYear) * TicksPerDay; - // All OA dates must be greater than (not >=) OADateMinAsDouble - private const double OADateMinAsDouble = -657435.0; - // All OA dates must be less than (not <=) OADateMaxAsDouble - private const double OADateMaxAsDouble = 2958466.0; - - private const int DatePartYear = 0; - private const int DatePartDayOfYear = 1; - private const int DatePartMonth = 2; - private const int DatePartDay = 3; - - private static readonly int[] DaysToMonth365 = { - 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}; - private static readonly int[] DaysToMonth366 = { - 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}; - - public static readonly DateTime MinValue = new DateTime(MinTicks, DateTimeKind.Unspecified); - public static readonly DateTime MaxValue = new DateTime(MaxTicks, DateTimeKind.Unspecified); - - private const UInt64 TicksMask = 0x3FFFFFFFFFFFFFFF; - private const UInt64 FlagsMask = 0xC000000000000000; - private const UInt64 LocalMask = 0x8000000000000000; - private const Int64 TicksCeiling = 0x4000000000000000; - private const UInt64 KindUnspecified = 0x0000000000000000; - private const UInt64 KindUtc = 0x4000000000000000; - private const UInt64 KindLocal = 0x8000000000000000; - private const UInt64 KindLocalAmbiguousDst = 0xC000000000000000; - private const Int32 KindShift = 62; - - private const String TicksField = "ticks"; - private const String DateDataField = "dateData"; - - // The data is stored as an unsigned 64-bit integeter - // Bits 01-62: The value of 100-nanosecond ticks where 0 represents 1/1/0001 12:00am, up until the value - // 12/31/9999 23:59:59.9999999 - // Bits 63-64: A four-state value that describes the DateTimeKind value of the date time, with a 2nd - // value for the rare case where the date time is local, but is in an overlapped daylight - // savings time hour and it is in daylight savings time. This allows distinction of these - // otherwise ambiguous local times and prevents data loss when round tripping from Local to - // UTC time. - private UInt64 dateData; - - // Constructs a DateTime from a tick count. The ticks - // argument specifies the date as the number of 100-nanosecond intervals - // that have elapsed since 1/1/0001 12:00am. - // - public DateTime(long ticks) { - if (ticks < MinTicks || ticks > MaxTicks) - throw new ArgumentOutOfRangeException(nameof(ticks), Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadTicks")); - Contract.EndContractBlock(); - dateData = (UInt64)ticks; - } - - private DateTime(UInt64 dateData) { - this.dateData = dateData; - } - - public DateTime(long ticks, DateTimeKind kind) { - if (ticks < MinTicks || ticks > MaxTicks) { - throw new ArgumentOutOfRangeException(nameof(ticks), Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadTicks")); - } - if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) { - throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), nameof(kind)); - } - Contract.EndContractBlock(); - this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift)); - } - - internal DateTime(long ticks, DateTimeKind kind, Boolean isAmbiguousDst) { - if (ticks < MinTicks || ticks > MaxTicks) { - throw new ArgumentOutOfRangeException(nameof(ticks), Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadTicks")); - } - Contract.Requires(kind == DateTimeKind.Local, "Internal Constructor is for local times only"); - Contract.EndContractBlock(); - dateData = ((UInt64)ticks | (isAmbiguousDst ? KindLocalAmbiguousDst : KindLocal)); - } - - // Constructs a DateTime from a given year, month, and day. The - // time-of-day of the resulting DateTime is always midnight. - // - public DateTime(int year, int month, int day) { - this.dateData = (UInt64) DateToTicks(year, month, day); - } - - // Constructs a DateTime from a given year, month, and day for - // the specified calendar. The - // time-of-day of the resulting DateTime is always midnight. - // - public DateTime(int year, int month, int day, Calendar calendar) - : this(year, month, day, 0, 0, 0, calendar) { - } - - // Constructs a DateTime from a given year, month, day, hour, - // minute, and second. - // - public DateTime(int year, int month, int day, int hour, int minute, int second) { - this.dateData = (UInt64)(DateToTicks(year, month, day) + TimeToTicks(hour, minute, second)); - } - - public DateTime(int year, int month, int day, int hour, int minute, int second, DateTimeKind kind) { - if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) { - throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), nameof(kind)); - } - Contract.EndContractBlock(); - Int64 ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second); - this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift)); - } - - // Constructs a DateTime from a given year, month, day, hour, - // minute, and second for the specified calendar. - // - public DateTime(int year, int month, int day, int hour, int minute, int second, Calendar calendar) { - if (calendar == null) - throw new ArgumentNullException(nameof(calendar)); - Contract.EndContractBlock(); - this.dateData = (UInt64)calendar.ToDateTime(year, month, day, hour, minute, second, 0).Ticks; - } - - // Constructs a DateTime from a given year, month, day, hour, - // minute, and second. - // - public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond) { - if (millisecond < 0 || millisecond >= MillisPerSecond) { - throw new ArgumentOutOfRangeException(nameof(millisecond), Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1)); - } - Contract.EndContractBlock(); - Int64 ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second); - ticks += millisecond * TicksPerMillisecond; - if (ticks < MinTicks || ticks > MaxTicks) - throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange")); - this.dateData = (UInt64)ticks; - } - - public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, DateTimeKind kind) { - if (millisecond < 0 || millisecond >= MillisPerSecond) { - throw new ArgumentOutOfRangeException(nameof(millisecond), Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1)); - } - if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) { - throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), nameof(kind)); - } - Contract.EndContractBlock(); - Int64 ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second); - ticks += millisecond * TicksPerMillisecond; - if (ticks < MinTicks || ticks > MaxTicks) - throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange")); - this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift)); - } - - // Constructs a DateTime from a given year, month, day, hour, - // minute, and second for the specified calendar. - // - public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, Calendar calendar) { - if (calendar == null) - throw new ArgumentNullException(nameof(calendar)); - if (millisecond < 0 || millisecond >= MillisPerSecond) { - throw new ArgumentOutOfRangeException(nameof(millisecond), Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1)); - } - Contract.EndContractBlock(); - Int64 ticks = calendar.ToDateTime(year, month, day, hour, minute, second, 0).Ticks; - ticks += millisecond * TicksPerMillisecond; - if (ticks < MinTicks || ticks > MaxTicks) - throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange")); - this.dateData = (UInt64)ticks; - } - - public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, Calendar calendar, DateTimeKind kind) { - if (calendar == null) - throw new ArgumentNullException(nameof(calendar)); - if (millisecond < 0 || millisecond >= MillisPerSecond) { - throw new ArgumentOutOfRangeException(nameof(millisecond), Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1)); - } - if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) { - throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), nameof(kind)); - } - Contract.EndContractBlock(); - Int64 ticks = calendar.ToDateTime(year, month, day, hour, minute, second, 0).Ticks; - ticks += millisecond * TicksPerMillisecond; - if (ticks < MinTicks || ticks > MaxTicks) - throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange")); - this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift)); - } - - private DateTime(SerializationInfo info, StreamingContext context) { - if (info==null) - throw new ArgumentNullException(nameof(info)); - Contract.EndContractBlock(); - - Boolean foundTicks = false; - Boolean foundDateData = false; - Int64 serializedTicks = 0; - UInt64 serializedDateData = 0; - - - // Get the data - SerializationInfoEnumerator enumerator = info.GetEnumerator(); - while( enumerator.MoveNext()) { - switch( enumerator.Name) { - case TicksField: - serializedTicks = Convert.ToInt64(enumerator.Value, CultureInfo.InvariantCulture); - foundTicks = true; - break; - case DateDataField: - serializedDateData = Convert.ToUInt64(enumerator.Value, CultureInfo.InvariantCulture); - foundDateData = true; - break; - default: - // Ignore other fields for forward compatibility. - break; - } - } - if (foundDateData) { - this.dateData = serializedDateData; - } - else if (foundTicks) { - this.dateData = (UInt64)serializedTicks; - } - else { - throw new SerializationException(Environment.GetResourceString("Serialization_MissingDateTimeData")); - } - Int64 ticks = InternalTicks; - if (ticks < MinTicks || ticks > MaxTicks) { - throw new SerializationException(Environment.GetResourceString("Serialization_DateTimeTicksOutOfRange")); - } - } - - - - internal Int64 InternalTicks { - get { - return (Int64)(dateData & TicksMask); - } - } - - private UInt64 InternalKind { - get { - return (dateData & FlagsMask); - } - } - - // Returns the DateTime resulting from adding the given - // TimeSpan to this DateTime. - // - public DateTime Add(TimeSpan value) { - return AddTicks(value._ticks); - } - - // Returns the DateTime resulting from adding a fractional number of - // time units to this DateTime. - private DateTime Add(double value, int scale) { - long millis = (long)(value * scale + (value >= 0? 0.5: -0.5)); - if (millis <= -MaxMillis || millis >= MaxMillis) - throw new ArgumentOutOfRangeException(nameof(value), Environment.GetResourceString("ArgumentOutOfRange_AddValue")); - return AddTicks(millis * TicksPerMillisecond); - } - - // Returns the DateTime resulting from adding a fractional number of - // days to this DateTime. The result is computed by rounding the - // fractional number of days given by value to the nearest - // millisecond, and adding that interval to this DateTime. The - // value argument is permitted to be negative. - // - public DateTime AddDays(double value) { - return Add(value, MillisPerDay); - } - - // Returns the DateTime resulting from adding a fractional number of - // hours to this DateTime. The result is computed by rounding the - // fractional number of hours given by value to the nearest - // millisecond, and adding that interval to this DateTime. The - // value argument is permitted to be negative. - // - public DateTime AddHours(double value) { - return Add(value, MillisPerHour); - } - - // Returns the DateTime resulting from the given number of - // milliseconds to this DateTime. The result is computed by rounding - // the number of milliseconds given by value to the nearest integer, - // and adding that interval to this DateTime. The value - // argument is permitted to be negative. - // - public DateTime AddMilliseconds(double value) { - return Add(value, 1); - } - - // Returns the DateTime resulting from adding a fractional number of - // minutes to this DateTime. The result is computed by rounding the - // fractional number of minutes given by value to the nearest - // millisecond, and adding that interval to this DateTime. The - // value argument is permitted to be negative. - // - public DateTime AddMinutes(double value) { - return Add(value, MillisPerMinute); - } - - // Returns the DateTime resulting from adding the given number of - // months to this DateTime. The result is computed by incrementing - // (or decrementing) the year and month parts of this DateTime by - // months months, and, if required, adjusting the day part of the - // resulting date downwards to the last day of the resulting month in the - // resulting year. The time-of-day part of the result is the same as the - // time-of-day part of this DateTime. - // - // In more precise terms, considering this DateTime to be of the - // form y / m / d + t, where y is the - // year, m is the month, d is the day, and t is the - // time-of-day, the result is y1 / m1 / d1 + t, - // where y1 and m1 are computed by adding months months - // to y and m, and d1 is the largest value less than - // or equal to d that denotes a valid day in month m1 of year - // y1. - // - public DateTime AddMonths(int months) { - if (months < -120000 || months > 120000) throw new ArgumentOutOfRangeException(nameof(months), Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadMonths")); - Contract.EndContractBlock(); - int y = GetDatePart(DatePartYear); - int m = GetDatePart(DatePartMonth); - int d = GetDatePart(DatePartDay); - int i = m - 1 + months; - if (i >= 0) { - m = i % 12 + 1; - y = y + i / 12; - } - else { - m = 12 + (i + 1) % 12; - y = y + (i - 11) / 12; - } - if (y < 1 || y > 9999) { - throw new ArgumentOutOfRangeException(nameof(months), Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic")); - } - int days = DaysInMonth(y, m); - if (d > days) d = days; - return new DateTime((UInt64)(DateToTicks(y, m, d) + InternalTicks % TicksPerDay) | InternalKind); - } - - // Returns the DateTime resulting from adding a fractional number of - // seconds to this DateTime. The result is computed by rounding the - // fractional number of seconds given by value to the nearest - // millisecond, and adding that interval to this DateTime. The - // value argument is permitted to be negative. - // - public DateTime AddSeconds(double value) { - return Add(value, MillisPerSecond); - } - - // Returns the DateTime resulting from adding the given number of - // 100-nanosecond ticks to this DateTime. The value argument - // is permitted to be negative. - // - public DateTime AddTicks(long value) { - long ticks = InternalTicks; - if (value > MaxTicks - ticks || value < MinTicks - ticks) { - throw new ArgumentOutOfRangeException(nameof(value), Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic")); - } - return new DateTime((UInt64)(ticks + value) | InternalKind); - } - - // Returns the DateTime resulting from adding the given number of - // years to this DateTime. The result is computed by incrementing - // (or decrementing) the year part of this DateTime by value - // years. If the month and day of this DateTime is 2/29, and if the - // resulting year is not a leap year, the month and day of the resulting - // DateTime becomes 2/28. Otherwise, the month, day, and time-of-day - // parts of the result are the same as those of this DateTime. - // - public DateTime AddYears(int value) { - if (value < -10000 || value > 10000) - { - // DateTimeOffset.AddYears(int years) is implemented on top of DateTime.AddYears(int value). Use the more appropriate - // parameter name out of the two for the exception. - throw new ArgumentOutOfRangeException("years", Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadYears")); - } - Contract.EndContractBlock(); - return AddMonths(value * 12); - } - - // Compares two DateTime values, returning an integer that indicates - // their relationship. - // - public static int Compare(DateTime t1, DateTime t2) { - Int64 ticks1 = t1.InternalTicks; - Int64 ticks2 = t2.InternalTicks; - if (ticks1 > ticks2) return 1; - if (ticks1 < ticks2) return -1; - return 0; - } - - // Compares this DateTime to a given object. This method provides an - // implementation of the IComparable interface. The object - // argument must be another DateTime, or otherwise an exception - // occurs. Null is considered less than any instance. - // - // Returns a value less than zero if this object - public int CompareTo(Object value) { - if (value == null) return 1; - if (!(value is DateTime)) { - throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDateTime")); - } - - return Compare(this, (DateTime)value); - } - - public int CompareTo(DateTime value) { - return Compare(this, value); - } - - // Returns the tick count corresponding to the given year, month, and day. - // Will check the if the parameters are valid. - private static long DateToTicks(int year, int month, int day) { - if (year >= 1 && year <= 9999 && month >= 1 && month <= 12) { - int[] days = IsLeapYear(year)? DaysToMonth366: DaysToMonth365; - if (day >= 1 && day <= days[month] - days[month - 1]) { - int y = year - 1; - int n = y * 365 + y / 4 - y / 100 + y / 400 + days[month - 1] + day - 1; - return n * TicksPerDay; - } - } - throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay")); - } - - // Return the tick count corresponding to the given hour, minute, second. - // Will check the if the parameters are valid. - private static long TimeToTicks(int hour, int minute, int second) - { - //TimeSpan.TimeToTicks is a family access function which does no error checking, so - //we need to put some error checking out here. - if (hour >= 0 && hour < 24 && minute >= 0 && minute < 60 && second >=0 && second < 60) - { - return (TimeSpan.TimeToTicks(hour, minute, second)); - } - throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadHourMinuteSecond")); - } - - // Returns the number of days in the month given by the year and - // month arguments. - // - public static int DaysInMonth(int year, int month) { - if (month < 1 || month > 12) throw new ArgumentOutOfRangeException(nameof(month), Environment.GetResourceString("ArgumentOutOfRange_Month")); - Contract.EndContractBlock(); - // IsLeapYear checks the year argument - int[] days = IsLeapYear(year)? DaysToMonth366: DaysToMonth365; - return days[month] - days[month - 1]; - } - - // Converts an OLE Date to a tick count. - // This function is duplicated in COMDateTime.cpp - internal static long DoubleDateToTicks(double value) { - // The check done this way will take care of NaN - if (!(value < OADateMaxAsDouble) || !(value > OADateMinAsDouble)) - throw new ArgumentException(Environment.GetResourceString("Arg_OleAutDateInvalid")); - - // Conversion to long will not cause an overflow here, as at this point the "value" is in between OADateMinAsDouble and OADateMaxAsDouble - long millis = (long)(value * MillisPerDay + (value >= 0? 0.5: -0.5)); - // The interesting thing here is when you have a value like 12.5 it all positive 12 days and 12 hours from 01/01/1899 - // However if you a value of -12.25 it is minus 12 days but still positive 6 hours, almost as though you meant -11.75 all negative - // This line below fixes up the millis in the negative case - if (millis < 0) { - millis -= (millis % MillisPerDay) * 2; - } - - millis += DoubleDateOffset / TicksPerMillisecond; - - if (millis < 0 || millis >= MaxMillis) throw new ArgumentException(Environment.GetResourceString("Arg_OleAutDateScale")); - return millis * TicksPerMillisecond; - } - - // Checks if this DateTime is equal to a given object. Returns - // true if the given object is a boxed DateTime and its value - // is equal to the value of this DateTime. Returns false - // otherwise. - // - public override bool Equals(Object value) { - if (value is DateTime) { - return InternalTicks == ((DateTime)value).InternalTicks; - } - return false; - } - - public bool Equals(DateTime value) { - return InternalTicks == value.InternalTicks; - } - - // Compares two DateTime values for equality. Returns true if - // the two DateTime values are equal, or false if they are - // not equal. - // - public static bool Equals(DateTime t1, DateTime t2) { - return t1.InternalTicks == t2.InternalTicks; - } - - public static DateTime FromBinary(Int64 dateData) { - if ((dateData & (unchecked( (Int64) LocalMask))) != 0) { - // Local times need to be adjusted as you move from one time zone to another, - // just as they are when serializing in text. As such the format for local times - // changes to store the ticks of the UTC time, but with flags that look like a - // local date. - Int64 ticks = dateData & (unchecked((Int64)TicksMask)); - // Negative ticks are stored in the top part of the range and should be converted back into a negative number - if (ticks > TicksCeiling - TicksPerDay) { - ticks = ticks - TicksCeiling; - } - // Convert the ticks back to local. If the UTC ticks are out of range, we need to default to - // the UTC offset from MinValue and MaxValue to be consistent with Parse. - Boolean isAmbiguousLocalDst = false; - Int64 offsetTicks; - if (ticks < MinTicks) { - offsetTicks = TimeZoneInfo.GetLocalUtcOffset(DateTime.MinValue, TimeZoneInfoOptions.NoThrowOnInvalidTime).Ticks; - } - else if (ticks > MaxTicks) { - offsetTicks = TimeZoneInfo.GetLocalUtcOffset(DateTime.MaxValue, TimeZoneInfoOptions.NoThrowOnInvalidTime).Ticks; - } - else { - // Because the ticks conversion between UTC and local is lossy, we need to capture whether the - // time is in a repeated hour so that it can be passed to the DateTime constructor. - DateTime utcDt = new DateTime(ticks, DateTimeKind.Utc); - Boolean isDaylightSavings = false; - offsetTicks = TimeZoneInfo.GetUtcOffsetFromUtc(utcDt, TimeZoneInfo.Local, out isDaylightSavings, out isAmbiguousLocalDst).Ticks; - } - ticks += offsetTicks; - // Another behaviour of parsing is to cause small times to wrap around, so that they can be used - // to compare times of day - if (ticks < 0) { - ticks += TicksPerDay; - } - if (ticks < MinTicks || ticks > MaxTicks) { - throw new ArgumentException(Environment.GetResourceString("Argument_DateTimeBadBinaryData"), nameof(dateData)); - } - return new DateTime(ticks, DateTimeKind.Local, isAmbiguousLocalDst); - } - else { - return DateTime.FromBinaryRaw(dateData); - } - } - - // A version of ToBinary that uses the real representation and does not adjust local times. This is needed for - // scenarios where the serialized data must maintain compatibility - internal static DateTime FromBinaryRaw(Int64 dateData) { - Int64 ticks = dateData & (Int64)TicksMask; - if (ticks < MinTicks || ticks > MaxTicks) - throw new ArgumentException(Environment.GetResourceString("Argument_DateTimeBadBinaryData"), nameof(dateData)); - return new DateTime((UInt64)dateData); - } - - // Creates a DateTime from a Windows filetime. A Windows filetime is - // a long representing the date and time as the number of - // 100-nanosecond intervals that have elapsed since 1/1/1601 12:00am. - // - public static DateTime FromFileTime(long fileTime) { - return FromFileTimeUtc(fileTime).ToLocalTime(); - } - - public static DateTime FromFileTimeUtc(long fileTime) { - if (fileTime < 0 || fileTime > MaxTicks - FileTimeOffset) { - throw new ArgumentOutOfRangeException(nameof(fileTime), Environment.GetResourceString("ArgumentOutOfRange_FileTimeInvalid")); - } - Contract.EndContractBlock(); - - // This is the ticks in Universal time for this fileTime. - long universalTicks = fileTime + FileTimeOffset; - return new DateTime(universalTicks, DateTimeKind.Utc); - } - - // Creates a DateTime from an OLE Automation Date. - // - public static DateTime FromOADate(double d) { - return new DateTime(DoubleDateToTicks(d), DateTimeKind.Unspecified); - } - - void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { - if (info==null) { - throw new ArgumentNullException(nameof(info)); - } - Contract.EndContractBlock(); - - // Serialize both the old and the new format - info.AddValue(TicksField, InternalTicks); - info.AddValue(DateDataField, dateData); - } - - public Boolean IsDaylightSavingTime() { - if (Kind == DateTimeKind.Utc) { - return false; - } - return TimeZoneInfo.Local.IsDaylightSavingTime(this, TimeZoneInfoOptions.NoThrowOnInvalidTime); - } - - public static DateTime SpecifyKind(DateTime value, DateTimeKind kind) { - return new DateTime(value.InternalTicks, kind); - } - - public Int64 ToBinary() { - if (Kind == DateTimeKind.Local) { - // Local times need to be adjusted as you move from one time zone to another, - // just as they are when serializing in text. As such the format for local times - // changes to store the ticks of the UTC time, but with flags that look like a - // local date. - - // To match serialization in text we need to be able to handle cases where - // the UTC value would be out of range. Unused parts of the ticks range are - // used for this, so that values just past max value are stored just past the - // end of the maximum range, and values just below minimum value are stored - // at the end of the ticks area, just below 2^62. - TimeSpan offset = TimeZoneInfo.GetLocalUtcOffset(this, TimeZoneInfoOptions.NoThrowOnInvalidTime); - Int64 ticks = Ticks; - Int64 storedTicks = ticks - offset.Ticks; - if (storedTicks < 0) { - storedTicks = TicksCeiling + storedTicks; - } - return storedTicks | (unchecked((Int64) LocalMask)); - } - else { - return (Int64)dateData; - } - } - - // Returns the date part of this DateTime. The resulting value - // corresponds to this DateTime with the time-of-day part set to - // zero (midnight). - // - public DateTime Date { - get { - Int64 ticks = InternalTicks; - return new DateTime((UInt64)(ticks - ticks % TicksPerDay) | InternalKind); - } - } - - // Returns a given date part of this DateTime. This method is used - // to compute the year, day-of-year, month, or day part. - private int GetDatePart(int part) { - Int64 ticks = InternalTicks; - // n = number of days since 1/1/0001 - int n = (int)(ticks / TicksPerDay); - // y400 = number of whole 400-year periods since 1/1/0001 - int y400 = n / DaysPer400Years; - // n = day number within 400-year period - n -= y400 * DaysPer400Years; - // y100 = number of whole 100-year periods within 400-year period - int y100 = n / DaysPer100Years; - // Last 100-year period has an extra day, so decrement result if 4 - if (y100 == 4) y100 = 3; - // n = day number within 100-year period - n -= y100 * DaysPer100Years; - // y4 = number of whole 4-year periods within 100-year period - int y4 = n / DaysPer4Years; - // n = day number within 4-year period - n -= y4 * DaysPer4Years; - // y1 = number of whole years within 4-year period - int y1 = n / DaysPerYear; - // Last year has an extra day, so decrement result if 4 - if (y1 == 4) y1 = 3; - // If year was requested, compute and return it - if (part == DatePartYear) { - return y400 * 400 + y100 * 100 + y4 * 4 + y1 + 1; - } - // n = day number within year - n -= y1 * DaysPerYear; - // If day-of-year was requested, return it - if (part == DatePartDayOfYear) return n + 1; - // Leap year calculation looks different from IsLeapYear since y1, y4, - // and y100 are relative to year 1, not year 0 - bool leapYear = y1 == 3 && (y4 != 24 || y100 == 3); - int[] days = leapYear? DaysToMonth366: DaysToMonth365; - // All months have less than 32 days, so n >> 5 is a good conservative - // estimate for the month - int m = (n >> 5) + 1; - // m = 1-based month number - while (n >= days[m]) m++; - // If month was requested, return it - if (part == DatePartMonth) return m; - // Return 1-based day-of-month - return n - days[m - 1] + 1; - } - - // Returns the day-of-month part of this DateTime. The returned - // value is an integer between 1 and 31. - // - public int Day { - get { - Contract.Ensures(Contract.Result<int>() >= 1); - Contract.Ensures(Contract.Result<int>() <= 31); - return GetDatePart(DatePartDay); - } - } - - // Returns the day-of-week part of this DateTime. The returned value - // is an integer between 0 and 6, where 0 indicates Sunday, 1 indicates - // Monday, 2 indicates Tuesday, 3 indicates Wednesday, 4 indicates - // Thursday, 5 indicates Friday, and 6 indicates Saturday. - // - public DayOfWeek DayOfWeek { - get { - Contract.Ensures(Contract.Result<DayOfWeek>() >= DayOfWeek.Sunday); - Contract.Ensures(Contract.Result<DayOfWeek>() <= DayOfWeek.Saturday); - return (DayOfWeek)((InternalTicks / TicksPerDay + 1) % 7); - } - } - - // Returns the day-of-year part of this DateTime. The returned value - // is an integer between 1 and 366. - // - public int DayOfYear { - get { - Contract.Ensures(Contract.Result<int>() >= 1); - Contract.Ensures(Contract.Result<int>() <= 366); // leap year - return GetDatePart(DatePartDayOfYear); - } - } - - // Returns the hash code for this DateTime. - // - public override int GetHashCode() { - Int64 ticks = InternalTicks; - return unchecked((int)ticks) ^ (int)(ticks >> 32); - } - - // Returns the hour part of this DateTime. The returned value is an - // integer between 0 and 23. - // - public int Hour { - get { - Contract.Ensures(Contract.Result<int>() >= 0); - Contract.Ensures(Contract.Result<int>() < 24); - return (int)((InternalTicks / TicksPerHour) % 24); - } - } - - internal Boolean IsAmbiguousDaylightSavingTime() { - return (InternalKind == KindLocalAmbiguousDst); - } - - [Pure] - public DateTimeKind Kind { - get { - switch (InternalKind) { - case KindUnspecified: - return DateTimeKind.Unspecified; - case KindUtc: - return DateTimeKind.Utc; - default: - return DateTimeKind.Local; - } - } - } - - // Returns the millisecond part of this DateTime. The returned value - // is an integer between 0 and 999. - // - public int Millisecond { - get { - Contract.Ensures(Contract.Result<int>() >= 0); - Contract.Ensures(Contract.Result<int>() < 1000); - return (int)((InternalTicks/ TicksPerMillisecond) % 1000); - } - } - - // Returns the minute part of this DateTime. The returned value is - // an integer between 0 and 59. - // - public int Minute { - get { - Contract.Ensures(Contract.Result<int>() >= 0); - Contract.Ensures(Contract.Result<int>() < 60); - return (int)((InternalTicks / TicksPerMinute) % 60); - } - } - - // Returns the month part of this DateTime. The returned value is an - // integer between 1 and 12. - // - public int Month { - get { - Contract.Ensures(Contract.Result<int>() >= 1); - return GetDatePart(DatePartMonth); - } - } - - // Returns a DateTime representing the current date and time. The - // resolution of the returned value depends on the system timer. For - // Windows NT 3.5 and later the timer resolution is approximately 10ms, - // for Windows NT 3.1 it is approximately 16ms, and for Windows 95 and 98 - // it is approximately 55ms. - // - public static DateTime Now { - get { - Contract.Ensures(Contract.Result<DateTime>().Kind == DateTimeKind.Local); - - DateTime utc = UtcNow; - Boolean isAmbiguousLocalDst = false; - Int64 offset = TimeZoneInfo.GetDateTimeNowUtcOffsetFromUtc(utc, out isAmbiguousLocalDst).Ticks; - long tick = utc.Ticks + offset; - if (tick>DateTime.MaxTicks) { - return new DateTime(DateTime.MaxTicks, DateTimeKind.Local); - } - if (tick<DateTime.MinTicks) { - return new DateTime(DateTime.MinTicks, DateTimeKind.Local); - } - return new DateTime(tick, DateTimeKind.Local, isAmbiguousLocalDst); - } - } - - public static DateTime UtcNow { - get { - Contract.Ensures(Contract.Result<DateTime>().Kind == DateTimeKind.Utc); - // following code is tuned for speed. Don't change it without running benchmark. - long ticks = 0; - ticks = GetSystemTimeAsFileTime(); - - return new DateTime( ((UInt64)(ticks + FileTimeOffset)) | KindUtc); - } - } - - - [MethodImplAttribute(MethodImplOptions.InternalCall)] - internal static extern long GetSystemTimeAsFileTime(); - - - - // Returns the second part of this DateTime. The returned value is - // an integer between 0 and 59. - // - public int Second { - get { - Contract.Ensures(Contract.Result<int>() >= 0); - Contract.Ensures(Contract.Result<int>() < 60); - return (int)((InternalTicks / TicksPerSecond) % 60); - } - } - - // Returns the tick count for this DateTime. The returned value is - // the number of 100-nanosecond intervals that have elapsed since 1/1/0001 - // 12:00am. - // - public long Ticks { - get { - return InternalTicks; - } - } - - // Returns the time-of-day part of this DateTime. The returned value - // is a TimeSpan that indicates the time elapsed since midnight. - // - public TimeSpan TimeOfDay { - get { - return new TimeSpan(InternalTicks % TicksPerDay); - } - } - - // Returns a DateTime representing the current date. The date part - // of the returned value is the current date, and the time-of-day part of - // the returned value is zero (midnight). - // - public static DateTime Today { - get { - return DateTime.Now.Date; - } - } - - // Returns the year part of this DateTime. The returned value is an - // integer between 1 and 9999. - // - public int Year { - get { - Contract.Ensures(Contract.Result<int>() >= 1 && Contract.Result<int>() <= 9999); - return GetDatePart(DatePartYear); - } - } - - // Checks whether a given year is a leap year. This method returns true if - // year is a leap year, or false if not. - // - public static bool IsLeapYear(int year) { - if (year < 1 || year > 9999) { - throw new ArgumentOutOfRangeException(nameof(year), Environment.GetResourceString("ArgumentOutOfRange_Year")); - } - Contract.EndContractBlock(); - return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0); - } - - // Constructs a DateTime from a string. The string must specify a - // date and optionally a time in a culture-specific or universal format. - // Leading and trailing whitespace characters are allowed. - // - public static DateTime Parse(String s) { - return (DateTimeParse.Parse(s, DateTimeFormatInfo.CurrentInfo, DateTimeStyles.None)); - } - - // Constructs a DateTime from a string. The string must specify a - // date and optionally a time in a culture-specific or universal format. - // Leading and trailing whitespace characters are allowed. - // - public static DateTime Parse(String s, IFormatProvider provider) { - return (DateTimeParse.Parse(s, DateTimeFormatInfo.GetInstance(provider), DateTimeStyles.None)); - } - - public static DateTime Parse(String s, IFormatProvider provider, DateTimeStyles styles) { - DateTimeFormatInfo.ValidateStyles(styles, nameof(styles)); - return (DateTimeParse.Parse(s, DateTimeFormatInfo.GetInstance(provider), styles)); - } - - // Constructs a DateTime from a string. The string must specify a - // date and optionally a time in a culture-specific or universal format. - // Leading and trailing whitespace characters are allowed. - // - public static DateTime ParseExact(String s, String format, IFormatProvider provider) { - return (DateTimeParse.ParseExact(s, format, DateTimeFormatInfo.GetInstance(provider), DateTimeStyles.None)); - } - - // Constructs a DateTime from a string. The string must specify a - // date and optionally a time in a culture-specific or universal format. - // Leading and trailing whitespace characters are allowed. - // - public static DateTime ParseExact(String s, String format, IFormatProvider provider, DateTimeStyles style) { - DateTimeFormatInfo.ValidateStyles(style, nameof(style)); - return (DateTimeParse.ParseExact(s, format, DateTimeFormatInfo.GetInstance(provider), style)); - } - - public static DateTime ParseExact(String s, String[] formats, IFormatProvider provider, DateTimeStyles style) { - DateTimeFormatInfo.ValidateStyles(style, nameof(style)); - return DateTimeParse.ParseExactMultiple(s, formats, DateTimeFormatInfo.GetInstance(provider), style); - } - - public TimeSpan Subtract(DateTime value) { - return new TimeSpan(InternalTicks - value.InternalTicks); - } - - public DateTime Subtract(TimeSpan value) { - long ticks = InternalTicks; - long valueTicks = value._ticks; - if (ticks - MinTicks < valueTicks || ticks - MaxTicks > valueTicks) { - throw new ArgumentOutOfRangeException(nameof(value), Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic")); - } - return new DateTime((UInt64)(ticks - valueTicks) | InternalKind); - } - - // This function is duplicated in COMDateTime.cpp - private static double TicksToOADate(long value) { - if (value == 0) - return 0.0; // Returns OleAut's zero'ed date value. - if (value < TicksPerDay) // This is a fix for VB. They want the default day to be 1/1/0001 rathar then 12/30/1899. - value += DoubleDateOffset; // We could have moved this fix down but we would like to keep the bounds check. - if (value < OADateMinAsTicks) - throw new OverflowException(Environment.GetResourceString("Arg_OleAutDateInvalid")); - // Currently, our max date == OA's max date (12/31/9999), so we don't - // need an overflow check in that direction. - long millis = (value - DoubleDateOffset) / TicksPerMillisecond; - if (millis < 0) { - long frac = millis % MillisPerDay; - if (frac != 0) millis -= (MillisPerDay + frac) * 2; - } - return (double)millis / MillisPerDay; - } - - // Converts the DateTime instance into an OLE Automation compatible - // double date. - public double ToOADate() { - return TicksToOADate(InternalTicks); - } - - public long ToFileTime() { - // Treats the input as local if it is not specified - return ToUniversalTime().ToFileTimeUtc(); - } - - public long ToFileTimeUtc() { - // Treats the input as universal if it is not specified - long ticks = ((InternalKind & LocalMask) != 0) ? ToUniversalTime().InternalTicks : this.InternalTicks; - ticks -= FileTimeOffset; - if (ticks < 0) { - throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_FileTimeInvalid")); - } - return ticks; - } - - public DateTime ToLocalTime() - { - return ToLocalTime(false); - } - - internal DateTime ToLocalTime(bool throwOnOverflow) - { - if (Kind == DateTimeKind.Local) { - return this; - } - Boolean isDaylightSavings = false; - Boolean isAmbiguousLocalDst = false; - Int64 offset = TimeZoneInfo.GetUtcOffsetFromUtc(this, TimeZoneInfo.Local, out isDaylightSavings, out isAmbiguousLocalDst).Ticks; - long tick = Ticks + offset; - if (tick > DateTime.MaxTicks) - { - if (throwOnOverflow) - throw new ArgumentException(Environment.GetResourceString("Arg_ArgumentOutOfRangeException")); - else - return new DateTime(DateTime.MaxTicks, DateTimeKind.Local); - } - if (tick < DateTime.MinTicks) - { - if (throwOnOverflow) - throw new ArgumentException(Environment.GetResourceString("Arg_ArgumentOutOfRangeException")); - else - return new DateTime(DateTime.MinTicks, DateTimeKind.Local); - } - return new DateTime(tick, DateTimeKind.Local, isAmbiguousLocalDst); - } - - public String ToLongDateString() { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, "D", DateTimeFormatInfo.CurrentInfo); - } - - public String ToLongTimeString() { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, "T", DateTimeFormatInfo.CurrentInfo); - } - - public String ToShortDateString() { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, "d", DateTimeFormatInfo.CurrentInfo); - } - - public String ToShortTimeString() { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, "t", DateTimeFormatInfo.CurrentInfo); - } - - public override String ToString() { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, null, DateTimeFormatInfo.CurrentInfo); - } - - public String ToString(String format) { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, format, DateTimeFormatInfo.CurrentInfo); - } - - public String ToString(IFormatProvider provider) { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, null, DateTimeFormatInfo.GetInstance(provider)); - } - - public String ToString(String format, IFormatProvider provider) { - Contract.Ensures(Contract.Result<String>() != null); - return DateTimeFormat.Format(this, format, DateTimeFormatInfo.GetInstance(provider)); - } - - public DateTime ToUniversalTime() { - return TimeZoneInfo.ConvertTimeToUtc(this, TimeZoneInfoOptions.NoThrowOnInvalidTime); - } - - public static Boolean TryParse(String s, out DateTime result) { - return DateTimeParse.TryParse(s, DateTimeFormatInfo.CurrentInfo, DateTimeStyles.None, out result); - } - - public static Boolean TryParse(String s, IFormatProvider provider, DateTimeStyles styles, out DateTime result) { - DateTimeFormatInfo.ValidateStyles(styles, nameof(styles)); - return DateTimeParse.TryParse(s, DateTimeFormatInfo.GetInstance(provider), styles, out result); - } - - public static Boolean TryParseExact(String s, String format, IFormatProvider provider, DateTimeStyles style, out DateTime result) { - DateTimeFormatInfo.ValidateStyles(style, nameof(style)); - return DateTimeParse.TryParseExact(s, format, DateTimeFormatInfo.GetInstance(provider), style, out result); - } - - public static Boolean TryParseExact(String s, String[] formats, IFormatProvider provider, DateTimeStyles style, out DateTime result) { - DateTimeFormatInfo.ValidateStyles(style, nameof(style)); - return DateTimeParse.TryParseExactMultiple(s, formats, DateTimeFormatInfo.GetInstance(provider), style, out result); - } - - public static DateTime operator +(DateTime d, TimeSpan t) { - long ticks = d.InternalTicks; - long valueTicks = t._ticks; - if (valueTicks > MaxTicks - ticks || valueTicks < MinTicks - ticks) { - throw new ArgumentOutOfRangeException(nameof(t), Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic")); - } - return new DateTime((UInt64)(ticks + valueTicks) | d.InternalKind); - } - - public static DateTime operator -(DateTime d, TimeSpan t) { - long ticks = d.InternalTicks; - long valueTicks = t._ticks; - if (ticks - MinTicks < valueTicks || ticks - MaxTicks > valueTicks) { - throw new ArgumentOutOfRangeException(nameof(t), Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic")); - } - return new DateTime((UInt64)(ticks - valueTicks) | d.InternalKind); - } - - public static TimeSpan operator -(DateTime d1, DateTime d2) { - return new TimeSpan(d1.InternalTicks - d2.InternalTicks); - } - - public static bool operator ==(DateTime d1, DateTime d2) { - return d1.InternalTicks == d2.InternalTicks; - } - - public static bool operator !=(DateTime d1, DateTime d2) { - return d1.InternalTicks != d2.InternalTicks; - } - - public static bool operator <(DateTime t1, DateTime t2) { - return t1.InternalTicks < t2.InternalTicks; - } - - public static bool operator <=(DateTime t1, DateTime t2) { - return t1.InternalTicks <= t2.InternalTicks; - } - - public static bool operator >(DateTime t1, DateTime t2) { - return t1.InternalTicks > t2.InternalTicks; - } - - public static bool operator >=(DateTime t1, DateTime t2) { - return t1.InternalTicks >= t2.InternalTicks; - } - - - // Returns a string array containing all of the known date and time options for the - // current culture. The strings returned are properly formatted date and - // time strings for the current instance of DateTime. - public String[] GetDateTimeFormats() - { - Contract.Ensures(Contract.Result<String[]>() != null); - return (GetDateTimeFormats(CultureInfo.CurrentCulture)); - } - - // Returns a string array containing all of the known date and time options for the - // using the information provided by IFormatProvider. The strings returned are properly formatted date and - // time strings for the current instance of DateTime. - public String[] GetDateTimeFormats(IFormatProvider provider) - { - Contract.Ensures(Contract.Result<String[]>() != null); - return (DateTimeFormat.GetAllDateTimes(this, DateTimeFormatInfo.GetInstance(provider))); - } - - - // Returns a string array containing all of the date and time options for the - // given format format and current culture. The strings returned are properly formatted date and - // time strings for the current instance of DateTime. - public String[] GetDateTimeFormats(char format) - { - Contract.Ensures(Contract.Result<String[]>() != null); - return (GetDateTimeFormats(format, CultureInfo.CurrentCulture)); - } - - // Returns a string array containing all of the date and time options for the - // given format format and given culture. The strings returned are properly formatted date and - // time strings for the current instance of DateTime. - public String[] GetDateTimeFormats(char format, IFormatProvider provider) - { - Contract.Ensures(Contract.Result<String[]>() != null); - return (DateTimeFormat.GetAllDateTimes(this, format, DateTimeFormatInfo.GetInstance(provider))); - } - - // - // IConvertible implementation - // - - public TypeCode GetTypeCode() { - return TypeCode.DateTime; - } - - - /// <internalonly/> - bool IConvertible.ToBoolean(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Boolean")); - } - - /// <internalonly/> - char IConvertible.ToChar(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Char")); - } - - /// <internalonly/> - sbyte IConvertible.ToSByte(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "SByte")); - } - - /// <internalonly/> - byte IConvertible.ToByte(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Byte")); - } - - /// <internalonly/> - short IConvertible.ToInt16(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Int16")); - } - - /// <internalonly/> - ushort IConvertible.ToUInt16(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "UInt16")); - } - - /// <internalonly/> - int IConvertible.ToInt32(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Int32")); - } - - /// <internalonly/> - uint IConvertible.ToUInt32(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "UInt32")); - } - - /// <internalonly/> - long IConvertible.ToInt64(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Int64")); - } - - /// <internalonly/> - ulong IConvertible.ToUInt64(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "UInt64")); - } - - /// <internalonly/> - float IConvertible.ToSingle(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Single")); - } - - /// <internalonly/> - double IConvertible.ToDouble(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Double")); - } - - /// <internalonly/> - Decimal IConvertible.ToDecimal(IFormatProvider provider) { - throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromTo", "DateTime", "Decimal")); - } - - /// <internalonly/> - DateTime IConvertible.ToDateTime(IFormatProvider provider) { - return this; - } - - /// <internalonly/> - Object IConvertible.ToType(Type type, IFormatProvider provider) { - return Convert.DefaultToType((IConvertible)this, type, provider); - } - - // Tries to construct a DateTime from a given year, month, day, hour, - // minute, second and millisecond. - // - internal static Boolean TryCreate(int year, int month, int day, int hour, int minute, int second, int millisecond, out DateTime result) { - result = DateTime.MinValue; - if (year < 1 || year > 9999 || month < 1 || month > 12) { - return false; - } - int[] days = IsLeapYear(year) ? DaysToMonth366 : DaysToMonth365; - if (day < 1 || day > days[month] - days[month - 1]) { - return false; - } - if (hour < 0 || hour >= 24 || minute < 0 || minute >= 60 || second < 0 || second >= 60) { - return false; - } - if (millisecond < 0 || millisecond >= MillisPerSecond) { - return false; - } - long ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second); - - ticks += millisecond * TicksPerMillisecond; - if (ticks < MinTicks || ticks > MaxTicks) { - return false; - } - result = new DateTime(ticks, DateTimeKind.Unspecified); - return true; - } - } -} |