As I said in another comment, it's a national company so we operate in several different time zones. The issue comes from the fact that Ontario and Quebec (I think) are still changing their clocks. Otherwise I'm sure they could just change the clock on whatever server is running these legacy systems.

It's also a mainframe system so we are all logging into one system.

Also also (and I didn't find this out until this shit show happened) our employees in Saskatchewan have already been dealing with work time vs town time for like... well forever it looks like. So maybe the system NEVER could adjust for DST and the only reason it worked was because someone is manually adjusting the clock on the server. Idk. I'm at a complete fucking loss as to why this is an issue now, let alone how this could have been an ongoing issue in Saskatchewan for DECADES without anyone figuring out how to deal with it.