Using angularjs 1.2.26 i cant format my date input to the desired timezone, here's an example: http://plnkr.co/edit/CxCqoR3Awcl1NFrCZYjx?p=preview
{{'2015-07-10T12:37:08Z' | date : "MMMM d, y 'at' h:mma Z" : 'America/Bahia'}}
and
{{'2015-07-10T12:37:08Z' | date : "MMMM d, y 'at' h:mma Z" : 'Europe/Paris'}}
gave the same output respecting my browser's local timezone and ignoring the timezone i've set.