DateTimePicker timezones

[itg-assistant]

Mark Reed asked 2017-09-07 16:58:10 UTC

I was wondering if you guys had a datetime picker that doesn't do any timezone conversion to UTC?

We have a UI where a customer can select a date and time and then timezone for that datetime and we've been fighting Wisej's datetimepicker because it is converting it to UTC.

Thanks,
Mark

[itg-assistant]

Luca answered 2017-09-07 17:01:59 UTC

You need to set the timezone on the DateTimePicker?

Dates are always managed using UTC since the server and the client may very well be in different time zones. When the date arrives at the server, it is converted to local time using the timezone of the client for that specific session/thread. For example, a user in NY using a server in California would always have the dates using the NY timezone.

[itg-assistant]

Mark Reed answered 2017-09-07 17:22:50 UTC

I totally get that which is why I am having issues. Because the server is in UTC. The browser might be in Kiev and he might be setting the time to 8:00pm PST

[itg-assistant]

Luca answered 2017-09-07 17:26:26 UTC

What type of issues? UTC is the same as GMT or +0, the client in Kiev should always see and have the date values in Kiev time. Otherwise it’s a bug in Wisej.

[itg-assistant]

Mark Reed answered 2017-09-07 23:42:53 UTC

I think I got it working I added a new function to the customdatetimepicker like this.

public void SetValue(DateTime startTime, TimeZoneInfo originalTimeZone)
{
var diff = (originalTimeZone.BaseUtcOffset.TotalMinutes - Application.Browser.TimezoneOffset) - originalTimeZone.BaseUtcOffset.TotalMinutes;
startTime = startTime.AddMinutes(diff * -1);
startTime = DateTime.SpecifyKind(startTime, DateTimeKind.Utc);
this.Value = startTime;
}

[itg-assistant]

Mark Reed answered 2017-09-07 23:43:44 UTC

The regardless of the browser’s timezone it always show the same time in the datetimepicker textbox