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public bool isdates(string str)
{
bool _isDate = false;
string matchStr = "";
matchStr += @"^((((1[6-9]|[2-9]\d)\d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]\d|3[01]))|(((1[6-9]|[2-9]\d)\d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]\d|30))|(((1[6-9]|[2-9]\d)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|(((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))-0?2-29-)) ";
matchStr += @"(\s(((0?[0-9])|([1-2][0-3]))\:([0-5]?[0-9])((\s)|(\:([0-5]?[0-9])))))?$ ";
RegexOptions option = (RegexOptions.IgnoreCase | (RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace));
if (Regex.IsMatch(str, matchStr, option))
{
_isDate = true;
}
else
{
_isDate = false;
}
return _isDate;
}