Don’t want the payroll people confuse the night shift with the morning shift. It’s purely an economical arrangement. Besides I ain’t even American.

As someone who grew up with a 24-hour clock, I can deal with 12 hours. Usually there’s no confusion if your store opens at 7am or 7pm. But 12:30PM being a valid time and meaning ‘00:30 on the next day’ fucks me up every time.