. Net Change Date format

Source: Internet
Author: User

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

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