- Use now variable instead of walking the clock.
- Use iso format instead of seconds.
- Pass a Date object instead of an iso format to time.<methods>so
the methods off the Date object can be mocked in order to avoid
timezone specific tests. Since methods like getFullYear output the
year in whatever timezone the operating system is set to, these
methods must be mocked/mapped to their UTC equivalents when testing
such as getUTCFullYear.
- Remove offseting of time based on timezone as this is now covered
by mocking the getFullYear method and not needed for the decayInterval
as that only cares about time deltas.