Android Question datetime conversion issues

[RichyK68]

I've run into a problem with an app of mine since daylight saving came into effect overnight. I've done a few tests and the following code gives weird results:

Dim test1 As String = "17:10"
test1 = DateTime.Time(DateTime.TimeParse(test1))
Dim test2 As String = "00:00"
test2 = DateTime.Time(DateTime.TimeParse(test2))

Test1 now contains "17:10" and Test2 now contains "23:00".

Why does Test2 contain "23:00" when it should contain "00:00" ?

Why aren't they either both wrong or both right?

Thanks,

Richard

 

[RichyK68]

Oh and I'm already setting the format with

DateTime.TimeFormat = "HH:mm"

so I don't understand why the time comes out wrong.

 

[Erel]

Does it still show wrong results or only during the day DST changed?

 

[RichyK68]

I haven't tried anything since midday yesterday (I spent a few hours pulling my hair out with this one). I've just set my LG G2's timezone to GMT +0 and Test2 comes back with "00:00" which is now correct. I've then reset the G2 settings back to what they were to use network provided time/time zone and ran the test again, and Test2 comes back with "00:00". So I'm guessing there's probably a bug in the G2 with daylight savings change-over, or perhaps the condition only affects my device for the first 24 hours after change-over. I don't know, but my app is now behaving as it should. I won't know again until daylight saving ends, unfortunately.

 

[RichyK68]

One year later, daylight saving comes in to effect, and I'm having the very same issue. Must be a G2 issue. Here's hoping that the problem goes away tomorrow like it did last year.

 

[Erel]

What is the time zone setting? Note that you can use DateUtils.SetDateAndTime instead.

 

[RichyK68]

It uses auto-date & time, and auto-time zone (network-provided).

 

[MaFu]

Maybe the reason:
Normally the DST changes between 2:00AM and 3:00AM. Therefore on the DST change day 17:10 is in the new DST zone and 00:00 may converted to the old DST zone?