Bug 3779 - iOS and Android date difference (using web service)
Summary: iOS and Android date difference (using web service)
Alias: None
Product: Android
Classification: Xamarin
Component: BCL Class Libraries ()
Version: 4.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2012-03-07 05:53 UTC by Maxim
Modified: 2012-04-25 16:42 UTC (History)
3 users (show)

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

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Description Maxim 2012-03-07 05:53:30 UTC

I have an web service reference in project. In one method my app invoke method, which returns two date. Code is pretty simple, no any date conversions or math:
Console.WriteLine("Date: " + elem.date + " | Begin date: " + elem.workTime.startTime);

Under iOS it returns:
Date: 05.03.2012 0:00:00 | Begin date: 05.03.2012 15:30:00

It's a good result.

Under Android it returns:
Date: 04.03.2012 23:00:00 | Begin date: 05.03.2012 14:30:00

One hour was subtracted.

If I switched to US locale, it returns:
Date: 3/4/2012 11:00:00 PM | Begin date: 3/5/2012 2:30:00 PM

Note that I use iOS and Android simulators with Russian locale. How could I take dates in any Android app part without taking into account any locale settings? 

The problem is when I using web service. I tested web service via
SoapUI 3.6 - dates values are expected. In iOS simulator works fine
I noted that service reference code after calling method returns date
with kind = local. I tried to change it to unspecified with no
Comment 1 Maxim 2012-03-07 06:14:24 UTC
Example of raw data, which web service respond:
                 <type>Рабочее время</type>
Comment 2 Maxim 2012-03-12 05:16:36 UTC
Ok. The problem that in Android 2.3 emulator Moscow timezone is GMT+3, but since 2011 it's GMT+4 at any time of year (without daylight +1 hour/-1 switching).

So the questions are:
1. Is it possible to update Moscow or Russian timezones in Android 2.3?
2. How to ignore timezones when Mono's web service wrapper reads dates from XML-response to DateTime variables?
Comment 3 Eric Beisecker 2012-03-12 12:05:52 UTC
Hello Maxim,

So by default the DateTime class converts the Parsed time to whatever the current TimeZone is for the device / Emulator. 

A workaround that seems to work for me is you can explicitly convert a DateTime to whatever timezone using code similar to this.

var theTime = DateTime.Parse("2012-03-07T00:00:00+04:00"); // Gives me 2012-3-06 15:00 
var rusZone = TimeZoneInfo.FindSystemTimeZoneById("Europe/Moscow");
var convertedTime = TimeZoneInfo.ConvertTime(parsedTime, rusZone); // Now is 2012-3-07 00:00

I hope this helps.
Comment 4 Maxim 2012-04-25 16:06:18 UTC
Thank you. No more question about this issue.
Comment 5 Eric Beisecker 2012-04-25 16:42:17 UTC
Closing the bug