Does that mean your works timeclock is off?
That reminds me of a time I parked in an airport short term parking lot, and intentionally or otherwise (cynic says intentionally), they had their time set fast by about 5 minutes, so the card I got upon entering had the wrong time on it. Upon exit, I was gauging my time by the correct time, and I cut it too close to the 1 hr period, which resulted in a 2 hour charge, despite being under 1 hr, based on the correct time. When I questioned them about this, it seemed apparent they were well aware of it, and said the time is per hour, regardless of the actual time. "We have our own time" or some words to that effect.. I told them in that case, they should not print any time that even resembles the correct time, but they seemed to think it was just fine the way it was..