It is usually customary to store all datetime values ββin your database in GMT / UTC format.
, UTC , , wilpeck, :
EDIT:
:
StartDateTime, StartDateTimeOffset. " " (IST), 2009/10/13 14:45, 2009/10/13 09:15 UTC. , UTC (2009/10/13 09:15) StartDateTime +05: 30 StartDateTimeOffset. , , , UTC (2009/10/13 09:15) 2009/10/13 14:45.