ON, AT
The actual changing begins ON the stroke of 11.30. Why not AT?
Search from various English teachers...
Answers · 3
2
They're interchangeable - either can be used! I think "on" is a shorter version of "upon", i.e. "upon the stroke of midnight, Jim arrived...", and means that precise point in time. (upon is rarely used, only in "old-fashioned" style writing)
1
Sometimes we just do things in English no one can explain!
0
I'd agree that you could use either preposition here.
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