Problem with TimeZoneInfo.ConvertTime: missed the Daylight Saving switch.
- by SirMoreno
My web app runs on .Net 3.5, all of the dates are saved on the DB in UTC time (not in user time).
When I want to display a date I convert it to user date (from UTC)
//Get the current datetime of the user exp: GMT TO ISRAEL +2
public static DateTime GetUserDateTime(DateTime dateUTC)
{
string userTzId = "Israel Standard Time";
TimeZoneInfo userTZ = TimeZoneInfo.FindSystemTimeZoneById(userTzId);
dateUTC = DateTime.SpecifyKind(dateUTC, DateTimeKind.Utc);
DateTime ret = TimeZoneInfo.ConvertTime(dateUTC, TimeZoneInfo.Utc, userTZ);
return ret;
}
Until now it worked fine but I have users from Israel (GMT +2), and Israel switched to Daylight saving time on 26/3/10 so now it's (GMT +3).
For some reason the TimeZoneInfo.ConvertTime don't know the Daylight saving time switch is on 26/3/10 so it still converts to GMT +2.
The strange thing is that on localhost it works fine, I set up a test page:
DateTime userdate = GetUserDateTime(DateTime.UtcNow);
string str2 = "UserDateTime = " + userdate.ToString("dd/MM/yy") + " " + userdate.ToString("HH:mm");
On the Server (windows 2003 set to UTC time) it shows the wrong time (+2):
UserDateTime = 27/03/10 21:38
On localhost (windows XP set to Israel Time) it shows the correct time (+3):
UserDateTime = 27/03/10 22:38
How can I update the TimeZoneInfo that the Daylight saving time switch in Israel was on the 26/3/10?
Thanks.
