don't parse a Time as a string

Mysql2 returns times as times, instead of strings

refs CNVS-7032

Change-Id: If1a1d0760cf1b7817bb34383c42865c0482a84d0
Reviewed-on: https://gerrit.instructure.com/28777
Reviewed-by: Nick Cloward <ncloward@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>