What time is it in Merida?

Mexico spans 12 time zones, so the answer depends on where in it you mean. Merida covers campeche, yucatan and is on the same clock as Mexico City, though the two are separate zones in the IANA database and can diverge when daylight saving rules differ.

Merida does not observe daylight saving, so its offset from UTC never moves. Its relationship to places that do change shifts twice a year instead.