JavaScript Reference

JavaScript – Date.UTC() Method

The Date.UTC() method returns the number of milliseconds between a specified date and midnight of January 1, 1970, according to UTC.

PHP Reference

PHP – date() Function

The PHP date() function formats a local date and time, and returns the formatted date string.

PHP Reference

PHP – date_add() Function

The PHP date_add() function adds a specified number of days, months, years, hours, minutes, and seconds to a date.

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