According to the decree that establishes the seasonal schedule in Mexico, the change to summer time occurs on the first Sunday of April in most of the country, but there are exceptions.
2021 summer time change in most of Mexico
For 2021, the time change begins on Sunday, April 4 at 2:00 AM. It ends on the last Sunday in October, this year being October 31, at 2:00 AM.
Summertime consists of moving the clock forward one hour, so it is recommended to do it on Saturday, April 3, before going to bed . . .
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