Fix datetime format used in Local Push Scheduling. Scheduling does not w...

Fix datetime format used in Local Push Scheduling. 
According to Parse Rest doc, push_time should be an ISO 8601 date without a time zone, i.e. 2014-10-16T12:00:00.
But it was formatted as 2014-10-16T12:00:00.000Z, then Local Push Scheduling does not work.