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Asked: 2026-06-07T11:19:16+00:00

I have a DateTime object DateTime dtt = new DateTime(2012, 6, 18, 12, 0,

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I have a DateTime object

DateTime dtt = new DateTime(2012, 6, 18, 12, 0, 0)

I am converting it to string this way

string str = dtt.ToString("yyyyMMddtt");

I get str as “20120618PM”

Fine till here

But when I try to convert this back to DateTime using DateTime.ParseExact() i get an error
String was not recognised a valid DateTime

dtt = DateTime.ParseExact(str, "yyyyMMddtt", null);

I even tried providing culture but I still get an error

dtt = DateTime.ParseExact(str, "yyyyMMddtt", CultureInfo.InvariantCulture);

What is wrong here which i am missing?

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1 Answer

  1. Editorial Team

    According to the documentation for the DateTime.ParseExact method you will get a FormatException in the following case.

    The hour component and the AM/PM designator in s do not agree.

    You don’t have an hour component at all and there cannot be any agreement leading to the exception.

    If you really want to stick with the format yyyyMMddtt you will have to perform your own parsing of the AM/PM part and based on that modify the time part of the DateTime. You can then parse the remainder of the date using yyyyMMdd.

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