from http://www.csharp-examples.net/string-format-datetime/
// create date time 2008-03-09 16:05:07.123 DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123); String.Format("{0:y yy yyy yyyy}", dt); // "8 08 008 2008" year String.Format("{0:M MM MMM MMMM}", dt); // "3 03 Mar March" month String.Format("{0:d dd ddd dddd}", dt); // "9 09 Sun Sunday" day String.Format("{0:h hh H HH}", dt); // "4 04 16 16" hour 12/24 String.Format("{0:m mm}", dt); // "5 05" minute String.Format("{0:s ss}", dt); // "7 07" second String.Format("{0:f ff fff ffff}", dt); // "1 12 123 1230" sec.fraction String.Format("{0:F FF FFF FFFF}", dt); // "1 12 123 123" without zeroes String.Format("{0:t tt}", dt); // "P PM" AM or PM String.Format("{0:z zz zzz}", dt); // "-6 -06 -06:00" time zone
See also:
Custom Date and Time Format Strings - MSDN
if you only have a string, just split the string into an array and concatenate the parts you want in a different order
String str = "Mon, dd Dec YYYY hh:mm:ss"; String[] strArr = str.Split(" "); str = strArr[2] + " " + strArr[3];
If the date may change, then do what SLaks posted in his answer
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