When doing accounting, are expenses cut off at midnight at the end of the period? or is there some leeway?

for example, if I had live entertainment playing from 10:00 pm to 1:00 am on the last/first day of the period would I have to prorate the cost between the two periods? and if possible, can you provide me the rationale behind your answer please
Answers

DR + Mrs Bears face

In the UK the expense would go in the period that the bill was paid.

Casey Y

You'd go at the start time for this scenario.

Judy

no prorating - go on start time