[323]

It's called 30-hour clock.

This convention is also used by some TV ratings measurement organizations - a show ending Tue 02:00 will be recorded as Mon 26:00, since it logically belonged to the day that ended, not the one that started.

[moogly]

Indeed, the "tv day" stretches from 02:00:00 to 25:59:59, but you usually don't actually use wall time (or in this case, modified wall time), and instead measure instant time as "minutes after midnight" (MAM) or "seconds after midnight" (SAM), so it's just an integer.