1 files changed, 16 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Globalization/CalendarWeekRule.cs b/src/mscorlib/shared/System/Globalization/CalendarWeekRule.cs
new file mode 100644
index 0000000000..b381b5c544
--- /dev/null
+++ b/src/mscorlib/shared/System/Globalization/CalendarWeekRule.cs
@@ -0,0 +1,16 @@
+// 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.Globalization
+{
+    [Serializable]
+    public enum CalendarWeekRule
+    {
+        FirstDay = 0,           // Week 1 begins on the first day of the year
+
+        FirstFullWeek = 1,      // Week 1 begins on first FirstDayOfWeek not before the first day of the year
+
+        FirstFourDayWeek = 2    // Week 1 begins on first FirstDayOfWeek such that FirstDayOfWeek+3 is not before the first day of the year        
+    };
+}