>How is it different from punch in at 8pm and out at 4am?
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>>We use 00:00 vs 24:00 in our software, We receive 00:00 from the punch clock, but in the back to do time calculation we translate to 24:00, because for example punch in at 20:00 and out at 00:00 does not lend itself to an obvious calculation, so we translate to 24:00 temporarily to find out the time elapse.

We would not receive 08:00pm, it is set to 24:00 clock. so we would receive 20:00. So the logic is if in is higher than out, than it must be over midnight, thus (4+2400)-2000= 8.00hrs