Bug 4227 - Incorrect result for DateTime.Now and TimeZone.CurrentTimeZone.GetUtcOffset() with Android 2.1
Summary: Incorrect result for DateTime.Now and TimeZone.CurrentTimeZone.GetUtcOffset()...
Status: RESOLVED DUPLICATE of bug 3520
Alias: None
Product: Android
Classification: Xamarin
Component: BCL Class Libraries ()
Version: 4.0
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2012-04-04 10:05 UTC by Jonathan Clement
Modified: 2012-04-18 05:10 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:


Attachments
Repro (10.82 KB, application/zip)
2012-04-04 10:05 UTC, Jonathan Clement
Details


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Status:
RESOLVED DUPLICATE of bug 3520

Description Jonathan Clement 2012-04-04 10:05:21 UTC
Created attachment 1620 [details]
Repro

DateTime.Now always return the UTC time and Time.CurrentTimeZone.GetUtcOffset() always return 0 on Android 2.1.

This does not seems to be device dependent. I get this result on an Sony Xperia X10, HTC Hero, Samsung Galaxy 550 and the emulator.

How to reproduce:

Set the 2.1 device or emulator timezone (in my case Eastern time).
Run the repro and look at the application output.

DateTime.Now and DateTime.UTCNow should not be the same. 
Time.CurrentTimeZone.GetUtcOffset() should not return 0.

Workaround :

// To get the right value for DateTime.Now
DateTime nowutc = DateTime.UtcNow;

DateTime correctedNow = TimeZoneInfo.ConvertTime(nowutc, TimeZoneInfo.Utc, TimeZoneInfo.FindSystemTimeZoneById(TimeZoneInfo.Local.Id));

// To get the right value for the current TimeZone
TimeZoneInfo.FindSystemTimeZoneById(TimeZoneInfo.Local.Id).GetUtcOffset(correctedNow);
Comment 1 Atsushi Eno 2012-04-18 05:10:56 UTC
This looks like the same issue as bug #3520 which I believe is Android 2.1 bionic issue.

*** This bug has been marked as a duplicate of bug 3520 ***