Daylight Saving nightmare

[dilettante]

Most filesystems Windows can use store timestamps in UTC values. <- Wrong!

You should use API calls to work with those, and where necessary for display or input purposes you can do conversions to and from local time at the "point of use." Always store UTC timestamps within files or databases you use to track things. <- More complicated than this.

This is a pretty classic newb mistake, and a reason why off the shelf utilities usually make more sense than hand-rolled code for something so common. <- Thus I don't do this myself.