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I'm trying out the DateTime.TryParseExact method, and I have come over a case that I just don't get. I have some formats and some subjects to parse that each should match one of the formats perfectly: var formats = new[] { "%H", "HH", "Hmm", "HHmm", "Hmmss", "HHmmss", }; var subjects = new[] { "1", "12", "123", "1234", "12345", "123456", }; I then try to parse them all and print out the results: foreach(var subject in subjects) { DateTime result; DateTime.TryParseExact(subject, formats, CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result); Console.WriteLine("{0,-6} : {1}", subject, result.ToString("T", CultureInfo.InvariantCulture)); } I get the following: 1 : 01:00:00 12 : 12:00:00 123 : 00:00:00 1234 : 12:34:00 12345 : 00:00:00 123456 : 12:34:56 And to my question... why is it failing on 123 and 12345? Shouldn't those have become 01:23:00 and 01:23:45? What am I missing here? And how can I get it to work as I would expect it to? Update: So, seems like we might have figured out why this is failing sort of. Seems like the H is actually grabbing two digits and then leaving just one for the mm , which would then fail. But, does anyone have a good idea on how I can change this code so that I would get the result I am looking for? Another update: Think I've found a reasonable solution now. Added it as an answer. Will accept it in 2 days unless someone else come up with an even better one. Thanks for the help!

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