c# - String not valid as a datetime string - Convert "yyyyMMdd" to datetime

Question

I have strings in format of "yyyyMMdd". I would like to convert them into DateTime with the format but I get an error that says the string is not valid as a DateTime string. How can I do this?

Answer 1

用于DateTime.ParseExact指定格式和不变的文化：

var date = DateTime.ParseExact(date, "yyyyMMdd", CultureInfo.InvariantCulture);

Answer 2

尝试DateTime.TryParseExact

DateTime dt;

DateTime.TryParseExact(textBox.Text, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt);

Answer 3

使用DateTime.ParseExact：

string dateString = "20130701";
DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", null, DateTimeStyles.None);

Answer 4

这个问题以前被问过并回答过。但这里是一个工作代码的例子：

string DateString = "20130701";
DateTime DT = DateTime.ParseExact(DateString, "yyyyMMdd", CultureInfo.InvariantCulture);

哪里CultureInfo.InvariantCulture是 System.Globalization 命名空间的一部分。 http://msdn.microsoft.com/en-us/library/system.globalization.cultureinfo(v=vs.71).aspx

Answer 5

将它们分解为 DateTime.Parse 将接受为有效的格式。您甚至可以使用正则表达式来解析信息

Regex format = new Regex("(?<year>^[0-9]{4})(?<month>[0-9]{2})(?<day>[0-9]{2})");
Match m = format.Match(inputString);
int year = int.Parse(m.Groups["year"].Value;
int month = int.Parse(m.Groups["month"].Value;
int day = int.Parse(m.Groups["day"].Value;
DateTime date = new DateTime(year, month, day);