How to handle SQL code for Daylight Savings for MST Time zone

Question

Hi,
1. My time zone is MST. My data showing differently as day light saving started from November. Please help me how to handle these issue.
2. After Mar 09 2014 Daylight saving going to end.( For this how to handle in the SQL codes)
Please answer for the above 2 doubts.
Thanks in advance.
Regards,
LuckyAbdul

Answer 1

Hi Abdul,
Daylight saving is basically like switching to another timezone. If your normal time zone is Mountain Standard Time (MST), you will switch to Mountain Daylight Time in the summer.
If daylight saving or timezones are a concern. It is best to store your dates in a DATETIMEOFFSET(0) column. This data type includes the offset between your selected timezone (MST or MDT) and UTC. The offset between MST and UTC is -7 hours and the offset
between MDT and UTC is -6 hours.
Be sure to datetimeoffset(0) and not just datetimeoffset. datetimeoffset(0) uses 8 bytes to store it's data (same as datetime), but datetimeoffset uses 10 bytes. This is especially important if you are going to index this column.
Also be sure to use a similar data type in your application or the timezone information will be lost. If it is an .Net application you should use The DateTimeOffset type. Most other programming languages have equivalent types.
Hope this helps. If you have anymore questions please let me know.
For more information see:
http://msdn.microsoft.com/en-us/library/bb630289.aspx
http://msdn.microsoft.com/en-us/library/ms187819.aspx
http://msdn.microsoft.com/en-us/library/system.datetimeoffset%28v=vs.110%29.aspx