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in this year Russia changes rules for daylight switch
redhat/microsoft delivers an update for timezone rules and everything correct in OS except mono!
today Mono will return wrong local time (-1 hour). I have checked it with 2.6.7 and 2.10.2.
but when I set local time to 2012 year Mono returns correct time.
short solution is to set TZ=MSK-4 in environment before launch a Mono application.
to get local time I use System.DateTime.Now
after switch to Summer Time in 2011 year Russian break a switch to winter time and fixed timezone.
ex Moscow has +4 TZ
but mono/C# DateTime.Now returns +3 TZ (w/o difference of the year)
*** This bug has been marked as a duplicate of bug 2167 ***