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Editorial Team
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Asked: 2026-06-15T03:11:13+00:00

I have a variable which is printed out using the following string format: var

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I have a variable which is printed out using the following string format:

var printThis = String.Format("{0:d}, {0:T}", dateAndTimeVar);

Now I have a problem; I need ‘{0:T}’ to display something like ‘–.–.–‘ when I have not set any time to the ‘dateAndTimeVar’. This seems not supported using the regular DateTime type (showing ‘00.00.00’ by default if there is no time set).

I can change the ‘dateAndTimeVar’ variable to anything (including other types), but the string formatting must remain the same.

Is there any solution to this?

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1 Answer

  1. Editorial Team

    You would need to create your own IFormatProvider and pass it into the String.Format method like this

    String.Format(new MyFormatProvider(), "{0:d}, {0:T}", dateAndTimeVar);

    The FormatProvider would then do a pass-through on all formats except T, where you would have your logic for outputting either the native T format for DateTime or –.–.– if the Time-part of DateTime is 00:00:00.

    Read about IFormatProvider on MSDN here

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