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Asked: 2026-05-11T03:30:15+00:00

I’m trying to parse a date/time string using DateTime.ParseExact . It works everywhere, except

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I’m trying to parse a date/time string using DateTime.ParseExact. It works everywhere, except on one machine – it just will not parse on that machine. The question is: Why? What could be different on that machine so that it will cause this behaviour?

Here are some things that I’ve already looked at:

  • The CultureInfo is passed to DateTime.ParseExact, namely CultureInfo.InvariantCulture
  • The regional settings on the rogue machine is the same as the settings on a machine where the parsing works.
  • Yes, the string is in the correct format, which is dd/MM/yyyy HH:mm:ss
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  1. I always find that regional settings can be tricky, and you can never assume that the users of your application will even have their machines setup correctly in the first place!

    A catch-all that I’ve been using to parse dates in if they have to be strings is to parse it in the ‘dd/MMM/yyyy’ format, e.g. ’14/JAN/2009′ will translate nicely no matter what the settings are.

    Incidentally this trick also works with SQL Server as well 🙂

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