如何在C#中验证日期时间？

string dateString = "2022-01-01";
DateTime dateTime;
if (DateTime.TryParse(dateString, out dateTime))
{
    Console.WriteLine("日期时间有效：" + dateTime.ToString());
}
else
{
    Console.WriteLine("日期时间无效：" + dateString);
}

string dateString = "2022-01-01";
DateTime dateTime;
if (DateTime.TryParseExact(dateString, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
{
    Console.WriteLine("日期时间有效：" + dateTime.ToString());
}
else
{
    Console.WriteLine("日期时间无效：" + dateString);
}