Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/mscorlib/system/globalization/datetimestyles.cs

@@ -0,0 +1,52 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+/*============================================================
+**
+** Enum:  DateTimeStyles.cs
+**
+**
+** Purpose: Contains valid formats for DateTime recognized by
+** the DateTime class' parsing code.
+**
+**
+===========================================================*/
+namespace System.Globalization {
+
+
+[Serializable]
+    [Flags]
+[System.Runtime.InteropServices.ComVisible(true)]
+    public enum DateTimeStyles {
+        // Bit flag indicating that leading whitespace is allowed. Character values
+        // 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, and 0x0020 are considered to be
+        // whitespace.
+
+
+        None                  = 0x00000000,
+
+        AllowLeadingWhite     = 0x00000001, 
+
+        AllowTrailingWhite    = 0x00000002, //Bitflag indicating trailing whitespace is allowed.
+
+        AllowInnerWhite       = 0x00000004,
+
+        AllowWhiteSpaces      = AllowLeadingWhite | AllowInnerWhite | AllowTrailingWhite,    
+        // When parsing a date/time string, if all year/month/day are missing, set the default date
+        // to 0001/1/1, instead of the current year/month/day.
+
+        NoCurrentDateDefault  = 0x00000008,
+        // When parsing a date/time string, if a timezone specifier ("GMT","Z","+xxxx", "-xxxx" exists), we will
+        // ajdust the parsed time based to GMT.
+
+        AdjustToUniversal     = 0x00000010,
+
+        AssumeLocal           = 0x00000020,
+
+        AssumeUniversal       = 0x00000040,
+        // Attempt to preserve whether the input is unspecified, local or UTC
+        RoundtripKind         = 0x00000080,
+    }
+}