IME, this gets shortened to half-past and drops the hour as it can be properly inferred as either in the range of the current, previous, or next hour. If not, the literal ( 2:30 )
My high school physics class leaned into this so hard. The homework assignments were from the book and the books had the answer written in. The due date anyone could ask for help with any of the problems. On tests, you could take in notes. It was all about process and correct application of...
On further thought there, I realised I was working from my default position of "in the perspective of a fair and honorable person" and failed to course correct, as that very likely does not apply to III.