Why can’t DateTime.ParseExact() parse the AM/PM in “4/4/2010 4:20:00 PM” using “M’/’d’/’yyyy H’:’mm’:’ss’ ‘tt”

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Make the hour format (H) lowercase like this:

DateTime.ParseExact(
            "4/4/2010 4:20:00 PM", 
            "M/d/yyyy h:mm:ss tt", 
            CultureInfo.InvariantCulture);

Uppercase “H” indicates 24-hour time and lowercase “h” indicates 12-hour time and will respect the AM/PM in the candidate string.

Side note: It is best to provide an instance of IFormatProvider to methods like this (even if it’s just CultureInfo.InvariantCulture). It’s one of those things that doesn’t really matter until you hit problems with it so it can be good to be in the habit of specifying culture information.

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