See if specified Time from time zone is during DST. Anyone have function?

Wanted to check and see if this is alredy done.
With time in UTC, and the users Time Zone, does anyone have a good function already created to see if its in DST.  i know that its the second Sunday in March is forward, and First Sunday in November is back.  
or maybe CVI has one built in I can't find.  Either way, it wouldn't be hard to do but don't know a good way to figure out certain weekday of a month.
Solved!
Go to Solution.

According to Microsoft's help description for their mktime() function, you can fill in a tm structure for the date you wish to test, but setting the tm_isdst field to a negative value first. This will force the function to calculate the correct value for the field - in other words it will then tell you if DST was in effect for that date.
I'm not sure if this is standard ANSI behaviour for this function, but it should be easy enough for you to test it out.
JR

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