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Change latest and earliest saved timezones on all day events to php official…

Description

Change latest and earliest saved timezones on all day events to php official timezones instead of guessing GMT offsets

Summary: Ref T8021, Change latest and earliest saved timezones on all day events to php official timezones instead of guessing GMT offsets

Test Plan: On different versions of php, create and save all day event in various timezones without errors.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T8021

Differential Revision: https://secure.phabricator.com/D12772