Why does the user have to use setTimezone method after creating a DateTime object from a timestamp in PHP?

When creating a DateTime object from a timestamp in PHP, the default timezone used is the one set in the php.ini file. If you want to work with a different timezone, you need to use the setTimezone method to set the desired timezone for the DateTime object. This ensures that any date/time calculations or formatting done with the DateTime object are based on the correct timezone. 

$timestamp = 1609459200; // example timestamp
$timezone = new DateTimeZone('America/New_York'); // desired timezone
$date = new DateTime();
$date->setTimestamp($timestamp);
$date->setTimezone($timezone);

Keywords

DateTime setTimezone timestamp PHP timezone

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