Detects if a string can be parsed to a valid date.

Using DateTime.Parse method ,we can check whether string is a valid date or not.If string date is valid,then it will return True otherwise return False.

public bool IsDate(this string astrText)
{
    try
    {
         System.DateTime dtDateTime = System.DateTime.Parse(astrText);
    }
    catch
    {
         return false;
    }

    return true;
}