Heartbeat across time zones - timing between sprint events.

I just got PSM1 certified, but I can't reasonably implement sprint event timing on my team.  Am I misinterpreting the scrum training, or are there other solutions without being "not scrum"? 

I remember reading multiple times that one iteration starts at the completion of the previous.  No break in between.  Not on the following Monday.  It looks like the scrum guide itself is a bit more forgiving in its adherence to strict timing.