No, you don't actually. The end time take up to 59 seconds after the minute...so it triggers whenever the minute is equal to that. There is no rounding, it's truncated . So, if the time is 12:01:59.9999, the rule will still use the 2nd range because the time is still 12:01.
From bruce:
So, if 12:00 is the ending time, it will trigger until 12:00:59.9999.
