How to check datetime format in a string?

Question

i got a string with a datetime value so i want to validate that the value is always with this format "yyyy-MM-ddTHH:mm:ss" how can i do that?

i have this code but it´s always throwing true.

  public Boolean validaFecha(string fecha)
    {
        DateTime dDate;
        Boolean resp = false;

        if (DateTime.TryParse(fecha, out dDate))
        {
            resp = true;
        }

        return resp;

    }

Please tell me you're not using this to check input for an sql command? — Joel Coehoorn, May 01 '16 at 22:37

score 2 · Accepted Answer · answered May 01 '16 at 22:23

You can use the DateTime.TryParseExact method and specify the format :

public static Boolean validaFecha(string fecha)    
{
    DateTime dDate;
    return DateTime.TryParseExact(fecha, "yyyy-MM-ddTHH:mm:ss", 
        CultureInfo.InvariantCulture, DateTimeStyles.None, out dDate);
}

Example of use :

bool isValid = validaFecha("2015-01-24T12:15:54"); // Will be true

score -1 · Answer 2 · answered May 01 '16 at 22:11

-1

Use :

DateTime.TryParseExact Method (String, String, IFormatProvider)

[MSDN Date Time Try Parse Exact][1]

answered May 01 '16 at 22:11

Avia

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can you give an example? – checo May 01 '16 at 22:22
Check this out: http://stackoverflow.com/questions/11999912/datetime-tryparseexact-rejecting-valid-formats – Avia May 01 '16 at 22:48

How to check datetime format in a string?

2 Answers2