加上引用： using System.Text.RegularExpressions;
/// <summary>
/// 检查字符串是否是日期格式 /// </summary>
/// <param name="s">2011-5-8 8:08:05</param>
/// <returns></returns>
public static string check(string s)
{
if (Regex.IsMatch(s,
"^((((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-)) (20|21|22|23|[0-1]?\\d):[0-5]?\\d:[0-5]?\\d$"))
{
return s;
}
else
{
return "";
}
}