it depends on how you want to show it.
and it also depends on what FileSystem the file are stored on or what archive format the files are stored in. some store filetime in UTC, some store in LocalTime.. some store in LocalTime but with TZ info
standard zip only have a FileTime, that is local, but with no reference, some without,
The DST issue is a problem is always going to be a mess. and some special time periods during the switch can be impossible to solve