When the deadline is 11/23 don't delete my batches before 11/23 is over. You delete the batches before I can get home from work. At least tell me by what time you are planning to ruin my indexing experience on the deadline date.
I am not connected with FamilySearch.
I have read that the expiry time is related to Greenwich Mean Time/Coordinated Universal Time and expires midnight Greenwich Mean Time/Coordinated Universal Time
See Wikipedia https://en.wikipedia.org/wiki/Coordinated_Universal_Time This Wikipedia page has a map which shows the different time zones.
So if you live in USA the expiry time will be earlier in the day, and in summer you will beed to adjust for daylight saving time if you are living where daylight saving applies.