Board Thread:The Quarters - Q & A/@comment-23.28.17.205-20180918221339/@comment-25085701-20180924173932

Lady Alys replied that gem rollover happens within the first few days of a month, after your cron, and while the servers are located in the US, it shouldn't have an effect on your calendar/cron rollover. That's about an official answer as we can give at this time.