I've worked with calendar applications and todo managers, alarms, recurring events and all that. Our timekeeping mechanics are incredibly complex. 24hs before

I've worked with calendar applications and todo managers, alarms, recurring events and all that. Our timekeeping mechanics are incredibly complex. 24hs before 15:00 is USUALLY 15:00. But in some timezones, it can be (about once a year): 14:00, 16:00 or 14:59:59. It's currently Monday 11:02 here, but it's likely still Sunday in some parts of the world (or is it already Tuesday somewhere? Not sure which is right). So, right now "today" have no single meaning; it depends on where you are. Oh, and does your online meeting repeat at 14hs CET every Monday? Then for people in Argentina it will be at 9hs for six months a year, and at 10hs for another six months (due to CET having DST, but not Argentina).