Fix the build for time_t

Current code doesn't build because of an error injected into a patch
(ironically attempting to fix the build).

Tested: Code compiles within yocto 32 bit, and out of yocto 64 bit.
unit tests pass.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ibc4ea4617853bf717c10d812eb5d8a9352177f24