Enabling DST (the summertime and wintertime schedules across the globe) within your time zone might cause an unexpected shift in datetimes by 1 hour when you're trying to set filetimes with FileSetTime or read them with FileGetTime. This behaviour frequently causes bugreports like #3139 at https://www.autoitscript.com/trac/autoit/ticket/3139 'FileGetTime out by exactly one hour.', where it was classified as 'No bug'.
Now this isn't considered a bug when you're referring to the datetime as show