>I have a stamp
What does the stamp say?
>Or even tomorrow
Thursday and Friday are holidays, and immigration is closed. See
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> or does it have to be on the date of the 15th
Depends on the stamp. If you have an "under consideration stamp", AND you're not down in the islands, you should return on the day stamped.
IF you have an "extension of stay based on .... valid until.... ", you can renew your extension of stay no sooner than 30 days in advance (45 days at some immigration offices).