I know this sucks. Date stuff sucks hard. But: Imagine a date format like “dd-MM-yyyy h:mm” how would you tell for sure what time mode that is? AM / PM or 24 hour? I’d say: If there is no “a” in the date format, then that’s no AM / PM stuff and therefore it’s nice 24h stuff. What do you think?
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If you are given a date, such as 11:15, you can’t know whether it is AM or PM. Just as you don’t know whether when I say Deer, I mean one or more than one. As a program designer, you have to remove ambiguities or make assumptions. You could either force the data to have AM/PM, or tell the provider of the time to give it to you in 24 hour format, or you can assume that they are smart enough to realize that without AM/PM you have no way of knowing. Not knowing your situation, I can’t tell you how to proceed, but there are issues that transcend plain old programming. Like whether 1,000,000,000 is a billion or a milliard or a trillion or whether a ton is 1000 kilograms or ….