R1:50d158a8c4d9

Fix publish time on Phame Posts

Summary: This logic is inverted. Re-vert it.

Test Plan: Write and publish a new post, see publish time.

Reviewers: epriestley, joshuaspence

Reviewed By: joshuaspence

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14464