Daylight Saving Time

Gentlemen, I need some help. I am looking for any particular information or type of code ( a boolean hopefully) that will allow me to determine if a particular date that has occurred, occurred during daylight saving time. Google is not much help honestly so I was hoping someone on this board may have run into this before, or something I may have missed on a reference site. Thank-you to anyone who can help.
Just calculate time of start and end of DST in the year of unterest ant check if the particular date is between two time points.
Does your environment allow for use of CTime?
This is a good start as you'll need this information per time-zone to determine when Daylight savings occurred.
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