Specifying timezone abbreviation while parsing:
<?php
    $ts 
= new DateTime("1978-12-22 09:15 CET");
?>



Using timezone abbreviations is deprecated, one should always use either a default timezone, or the full identifier.



Specifying timezone identifier while parsing:
<?php
    $ts 
= new DateTime("1978-12-22 09:15 Europe/Oslo");
?>