. Net Change Date format

Example: changing the date format

The following code example uses a Regex. the Replace method replaces thedate in mm/dd/yy format with the date dd-mm-yy format.

Static string Mdytodmy (string  input) {     return  regex.replace (input,          "\ \ \ B (? <month>\\d{1,2})/(? <day>\\d{1,2})/(? <year>\\d{2,4}) \\b",          " ${day}-${month}-${year} " );}

The following code shows how to call the Mdytodmy method in an application .

usingSystem;usingSystem.Globalization;usingSystem.Text.RegularExpressions; Public classclass1{ Public Static voidMain () {stringdatestring = DateTime.Today.ToString ("D", Datetimeformatinfo.invariantinfo); stringResultstring =mdytodmy (datestring); Console.WriteLine ("converted {0} to {1}.", datestring, resultstring); }   Static stringMdytodmy (stringinput) {        returnregex.replace (Input,"\\b (? <month>\\d{1,2})/(? <day>\\d{1,2})/(? <year>\\d{2,4}) \\b",            "${day}-${month}-${year}"); }}//The example displays the following output to the console if run on 8/21/2007://converted 08/21/2007 to 21-08-2007.

Comments

The meaning of the regular expression pattern \b (? <month>\d{1,2})/(? <day>\d{1,2})/(? <year>\d{2,4}) \b is as shown in the following table.

Mode	Description
\b	Start a match at the word boundary.
(? <month>\d{1,2})	Matches one or two decimal digits. This is the month capture group.
/	Matches a left slash.
(? <day>\d{1,2})	Matches one or two decimal digits. This is the group that is captured by day.
/	Matches a left slash.
(? <year>\d{2,4})	Match two to four decimal digits. This is the group captured by year.
\b	Ends the match at the word boundary.

Pattern ${day}-${month}-${year} The replacement string is defined as shown in the following table.

Mode	Description
$ (day)	Adds a string captured by the day capture group.
-	Add hyphens.
$ (month)	Adds a string captured by the month capture group.
-	Add hyphens.
$ (year)	Adds a string captured by the year capture group.

. Net Change Date format