如何向String.Format参数添加前导零？

Question

我有以下代码：

string textTransDate = String.Format("{0}-{1}-{2} {3}:{4}", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute);

如果它们小于10，我想在月和日参数中添加前导零，我将如何实现此目标？

Answer 1

string textTransDate = DateTime.Now.ToString("yyyy-MM-dd HH:mm");

更多信息：

http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

Answer 2

String.Format(@"{0:yyyy-MM-dd HH\:mm}", DateTime.Now);

转义字符\：确保您将获得一个文字冒号分隔符而不是特定于文化的时间分隔符，以匹配您的原始代码。请参阅Custom Date and Time format strings in MSDN。

要获得数字参数的前导零，请查看Custom Numeric Format Strings：

String.Format("{0:0000}-{1:00}-{2:00} {3:00}:{4:00}", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute);

甚至Standard Numeric Format Strings：

String.Format("{0:D4}-{1:D2}-{2:D2} {3:D2}:{4:D2}", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute);

Answer 3

如果需要，

D2格式会添加前导零。

String.Format("{0}-{1:D2}-{2:D2} {3}:{4}", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute);

http://msdn.microsoft.com/en-us/library/0c899ak8.aspx

Answer 4

string textTransDate = String.Format("{0}-{1:00}-{2} {3}:{4}", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute);

Answer 5

这不会起作用：

string textTransDate = DateTime.Now.ToString("yy-MM-hh:mm");