every time i said that please first google your question
i google your question and found just in 0.02sec :)
why you don't try to search by yourself :confused:
below code will help you!
DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123);
String.Format("{0:y yy yyy yyyy}", dt);
String.Format("{0:M MM MMM MMMM}", dt);
String.Format("{0:d dd ddd dddd}", dt);
String.Format("{0:h hh H HH}", dt);
String.Format("{0:m mm}", dt);
String.Format("{0:s ss}", dt);
String.Format("{0:f ff fff ffff}", dt);
String.Format("{0:F FF FFF FFFF}", dt);
String.Format("{0:t tt}", dt);
String.Format("{0:z zz zzz}", dt);
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