Interestingly, in the languages where do you say "half ten", it unambiguously means 9:30 not 10:30. For example, in German you would say halb zehn (or "half te

Interestingly, in the languages where do you say "half ten", it unambiguously means 9:30 not 10:30. For example, in German you would say halb zehn (or "half ten" / "half to ten"), which means 9:30.