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Change-Id: I88afe21c489d3be7677434b4a0e75e1ca633b3e3
Set the timezone for the NSDateFormatter to UTC

The timezone needed to be generated in UTC time, because ISO-8601
formatted times are in UTC, but the NSDateFormatter automatically
assumes that you are parsing dates for the current default time
zone.

Bug: 66884
Change-Id: Ie3e5dc6db8b78ed329b8f7c00016001ee0e27e48