CODEWITHSUNDEEP
c#
derya
derya

Reputation: 65

How to verify strings are in a certain date format?

How can I verify that strings are in the format "dd.MM.yyyy HH:mm:ss.mmm"?

For example:

12.01.2011 13:26:10.000
13.05.2010 22:30:20.000

should be accepted, others should be rejected. I want to be able to do something like:

string c = "12.01.2011 13:26:10.000";

if (string.CompareFormat(c))
{
    // do something
}
else
{
    // do something else
}

Upvotes: 0

Views: 174

Answers (4)

Lucero
Lucero

Reputation: 60246

Use TryParseExact with your required date format. This will make sure that only this specific format is matched, in contrast to the normal Parse/TryParse.

string c = "12.01.2011 13:26:10.000";
DateTime result;
if (DateTime.TryParseExact(c, "dd.MM.yyyy HH:mm:ss.fff", CultureInfo.InvariantCulture, DateTimeStyles.None, out result)) {
    // do something
} else {
    // do something else
}

Upvotes: 1

Andrew Savinykh
Andrew Savinykh

Reputation: 26300

You can use TryParseExact:

        string format = "dd.MM.yyyy HH:mm:ss.fff";
        string c = "12.01.2011 13:26:10.000";
        CultureInfo enUS = new CultureInfo("en-US");

        DateTime result;
        if (DateTime.TryParseExact(c, format, enUS, DateTimeStyles.None, out result))
        {
            Console.WriteLine("Right Format");
        }
        else
        {
            Console.WriteLine("Wrong Format");                
        }

Upvotes: 2

Nighil
Nighil

Reputation: 4127

  try
            {
                string c = "12.01.2011 13:26:10.000";
                DateTime dt = Convert.ToDateTime(c.ToString());
            }
            catch (Exception ex)
            {
                //Rejected
            }

when it is not in datetime format exception will occur

or can use TryParse

string c = "12.01.2011 13:26:10.000";
                DateTime dt;
                if(!DateTime.TryParse(c,out dt))
                {
                //rejected
                }

Upvotes: 0

KristoferA
KristoferA

Reputation: 12397

Try parsing it with DateTime.TryParse...

Upvotes: 3

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