[Mono.Posix] Fix time_t conversions.

[mono.git] / mcs / class / Mono.Posix / Mono.Unix.Native / NativeConvert.cs

diff --git a/mcs/class/Mono.Posix/Mono.Unix.Native/NativeConvert.cs b/mcs/class/Mono.Posix/Mono.Unix.Native/NativeConvert.cs
index 4c56a293d517780d16e64f0e8107db4c6cf71dad..7951d08ae17377a58246b6f81b3df14cdecaf317 100644 (file)
--- a/mcs/class/Mono.Posix/Mono.Unix.Native/NativeConvert.cs
+++ b/mcs/class/Mono.Posix/Mono.Unix.Native/NativeConvert.cs
@@ -183,6 +183,8 @@ namespace Mono.Unix.Native {
                        return '-';
                }
 
+               public static readonly DateTime UnixEpoch =
+                       new DateTime (year:1970, month:1, day:1, hour:0, minute:0, second:0, kind:DateTimeKind.Utc);
                public static readonly DateTime LocalUnixEpoch = 
                        new DateTime (1970, 1, 1);
                public static readonly TimeSpan LocalUtcOffset = 
@@ -200,15 +202,18 @@ namespace Mono.Unix.Native {
 
                public static DateTime FromTimeT (long time)
                {
-                       DateTime r = LocalUnixEpoch.AddSeconds ((double) time + 
-                                       LocalUtcOffset.TotalSeconds);
-                       return r;
+                       return UnixEpoch.AddSeconds (time).ToLocalTime ();
                }
 
                public static long ToTimeT (DateTime time)
                {
-                       TimeSpan unixTime = time.Subtract (LocalUnixEpoch) - LocalUtcOffset;
-                       return (long) unixTime.TotalSeconds;
+                       if (time.Kind == DateTimeKind.Unspecified)
+                               throw new ArgumentException ("DateTimeKind.Unspecified is not supported. Use Local or Utc times.", "time");
+
+                       if (time.Kind == DateTimeKind.Local)
+                               time = time.ToUniversalTime ();
+
+                       return (long) (time - UnixEpoch).TotalSeconds;
                }
 
                public static OpenFlags ToOpenFlags (FileMode mode, FileAccess access)