To know all the time zones we can set by using date_default_timezone_set() function can be listed by using timezone_identifiers_list() . This function will return an array with list of time zones available. Here is the code to list all time zones.
Note that this way we can give an option to the users to select a time zone.
PHP code to generate dropdown list with timezones
Try to display a drop down list by taking data from the above array.
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