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TimeZoneInfo.ConvertTime does not convert anything

Running asp.net mvc 2 on win 7 with .net 4.0

I have a controller action method that gets 2 DateTime objects from a form. The user interface in the form uses jQueryUi datepicker (not sure if these matches).

A user who fills out this form will ALWAYS enter a date / time in the Hawaiian time zone.

I want to convert this to UTC and store it in a database.

When I call TimeZoneInfo.ConverTime (DateTime, TimeZoneInfo, TimeZoneInfo), it returns the same time as me, passing it without any conversion. I checked the debugger and the only thing that changed was changing the DateTime.Kind property to DateTimeKind.Utc.

public ActionResult New(ScheduleNew data){         
    TimeZoneInfo tz = TimeZoneInfo.FindSystemTimeZoneById( "Hawaiian Standard Time" );

    DateTime start = TimeZoneInfo.ConvertTime(data.StartDate, tz, TimeZoneInfo.Utc);
    DateTime end = TimeZoneInfo.ConvertTime(data.EndDate, tz, TimeZoneInfo.Utc);
}

I also tried an alternative version with the same results.

public ActionResult New(ScheduleNew data){
    DateTime start = new DateTime( data.StartDate.Year, data.StartDate.Month, data.StartDate.Day, data.StartDate.Hour, data.StartDate.Minute, data.StartDate.Second, DateTimeKind.Unspecified );
    DateTime end = new DateTime( data.EndDate.Year, data.EndDate.Month, data.EndDate.Day, data.EndDate.Hour, data.EndDate.Minute, data.EndDate.Second, DateTimeKind.Unspecified );

    TimeZoneInfo tz = TimeZoneInfo.FindSystemTimeZoneById( "Hawaiian Standard Time" );

    StartDate = TimeZoneInfo.ConvertTime(start, tz, TimeZoneInfo.Utc);
    EndDate = TimeZoneInfo.ConvertTime(end, tz, TimeZoneInfo.Utc),
}

ScheduleData - ViewModel , StartDate EndDate.

, , , , . , UTC.

, 10 , ( utc), , .AddHours(10), . , , , .

+5
4

, - :

 DateTime now = DateTime.UtcNow;

 TimeZoneInfo timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Hawaiian Standard Time");
 TimeSpan utcOffset = timeZoneInfo.GetUtcOffset(now);
 DateTime hawaiianTime = new DateTime(now.Ticks + utcOffset.Ticks, DateTimeKind.Local);

, . : , DateTimeKind.Utc( UTC). , GetUtcOffset() ...

GetUtcOffset()

, GetUtcOffset() DateTimes, DateTimeKind. (.. , - ). , DateTimeKind.Utc , Unspecified.

+4

... , . :

DateTime start = TimeZoneInfo.ConvertTimeToUtc(data.StartDat, tz);
+3

var dt = new DateTime(YourOldDate.Ticks, DateTimeKind.Utc);
DateTime NewDate = TimeZoneInfo.ConvertTime(dt, TimeZoneInfo.Local);

, , .

+2

, .

public ActionResult New(ScheduleNew data){         
    TimeZoneInfo tz = TimeZoneInfo.FindSystemTimeZoneById( "Hawaiian Standard Time" );

    DateTime start = TimeZoneInfo.ConvertTime(data.StartDate, tz, TimeZoneInfo.Utc);
    DateTime end = TimeZoneInfo.ConvertTime(data.EndDate, tz, TimeZoneInfo.Utc);
}

start end , . , , . , , .

, . data.StartDate data.EndDate Unspecified , . , TimeZoneInfo.ConvertTimeToUtc.

0

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