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I managed to manipulate the date and made the error happen, when I make the number of the month exceed 12, I entered the Start Date with month 21 and the error occurred, showed the date 01/01/1970 and in the Database >> event_start = 32400
It is dead with the same error of Xoops2.5.10 and language pt-br_utf8 ("Portugues do Brasil"), when I put the data in the "calendariozinho" as in the "text" mode of the event_start field appears correct, "d / m / Y ", example 2/21/2021 and the data that appears in the Database >> event_start = 32400
I will continue with more testing, I will change, on purpose, the day with the month in Xoops2.5.10 and language pt-br_utf8, on my website that the problem is happening.
"Suggestion for the masters, there should be a test in the" data "fields before recording in the database, thus avoiding the lay user at the time of configuration."