I need to sync a device internal clock on a device according to which timezone the users has selected. I'm using the following code to get the current time for that zone with respect to the system clock:
var currentInstant = SystemClock.Instance.GetCurrentInstant().InZone(userTimezone);
But I also need to be able to toggle a flag that enables/disables DST for the zone, meaning if the zone currently has DST active I need to be able to subtract the offset it adds, and only set the internal clock to the zone time with the standard offset.
I found the standard offset with (not 100% this is correct though):
But I'm not sure how to get the zone time using it?
It sounds like you're nearly there. You presumably want the
LocalDateTime, which you'd get like this:
var now = SystemClock.Instance.GetCurrentInstant(); var zoneInterval = zone.GetZoneInterval(now); var offset = zoneInterval.StandardOffset; // Ignore any savings OffsetDateTime offsetNow = now.WithOffset(offset);
You can get the
offsetNow.LocalDateTime if you need that.
At that point, you don't have a
ZonedDateTime, because you don't really have a time zone as such - your "zone without DST" isn't a regular time zone. But it sounds like it's what you need.
As Matt said, this is a fundamentally bad idea - I know you've tried to convince your client of that already, but it's probably worth thinking ahead and working out what you'll do when your client understands that it's a bad idea too...
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