how to tell convert.todatetime that the input is in format dd-mm-yyyy

have written code that is supposed to

• take time and date input from the user

• and convert it to datetime format

• add some value to hrs and display it.

My code works fine when the user gives input in the default format but when the user enters a date like dd-mm-yyyy instead of mm/dd/yyyy(default), it doesn't work.

How can I change the convert function to take care of this?

    DateTime dt_c开发者_如何学JAVAalc = new DateTime();
    dt_calc = Convert.ToDateTime(inputt);

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To convert a date in the format dd-mm-yyyy use:

var dateValue = DateTime.Parse("11/03/1989", new CultureInfo("en-GB", false));

But don't forget to add the System.Globalization in the header or just do it inline:

var dateValue = DateTime.Parse("11/03/1989", new System.Globalization.CultureInfo("en-AU", false));

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Don't use Convert - DateTime has Parse, TryParse, ParseExact and TryParseExact methods that take a IFormatProvider though for this simply using parse should work:

DateTime dt_calc = DateTime.Parse(inputt);

If you would rather be safe, use `TryParse:

DateTime dt_calc;
DateTime.TryParse(inputt, out dt_calc); // TryParse returns true if success, false if not

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Have a look at this Code Project that extends the DateTime parsing capabilities. Alternatively there's a Natural Date Parser class on GitHub.