Comment 10 for bug 1688327

Reviewed: https://review.openstack.org/469937
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=8c8e15c9ceb181a17b5c006fae2d48ad3a13e6fc
Submitter: Jenkins
Branch: stable/newton

commit 8c8e15c9ceb181a17b5c006fae2d48ad3a13e6fc
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)