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-// 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;
- }
- }
-}