Comment 7 for bug 1688327

Reviewed: https://review.openstack.org/465727
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=c6586707736fc4b8a0061b8d3f529562c3f933f2
Submitter: Jenkins
Branch: stable/ocata

commit c6586707736fc4b8a0061b8d3f529562c3f933f2
Author: Zane Bitter <email address hidden>
Date: Thu May 4 11:41:55 2017 -0400

    Deal correctly with negative elapsed time

    Since we're comparing local time to database time, we need to correctly
    handle negative offsets to account for clock skew. The datetime.timedelta
    class always reports a positive number of seconds, but with a possibly
    negative number of *days*. Therefore, take the days into account.

    Change-Id: I4422e4cf41cb57cdc89548d01b0abc27cda914ef
    Closes-Bug: #1688327
    (cherry picked from commit f3f05c9a3f6109ec1e102ac9677accb82eb6cc54)