My manager has a bee in his bonnet about people being in on time, and he will come and yell at everybody if he notices someone turning up at about 9:15 rather than 9:00. The thing is he gets in it about 6:00 and then goes home at 3:30 and disappears from about 10:00 till 2:00 on a massive lunch, my official start time is 9:30 but often he isn't actually in the main office, so how the hell does he know if people are turning up on time.

So we don't. He's hasn't noticed.