Replace chars order in string C#

Question

I have simple quesion but I have no idea how to solve it...

I have this string

RegisterDate = "25-05-2013";

I get this value via input. I want somehow to make this string be

RegisterDate = "2013-05-25";

My question is how could I do it?

Thanks

HAve you tried to google it first: msdn.microsoft.com/en-us/library/8kb3ddd4.aspx — radu florescu
– radu florescu, Commented May 25, 2013 at 8:35
You can simply do a string.split on '-' and change the order... — Carra
– Carra, Commented May 25, 2013 at 8:35

John Woo · Accepted Answer · 2013-05-25 08:35:18Z

5

Try to covert it to real date and convert it back again to string with your desired format.

RegisterDate = "25-5-2013"; DateTime _date = DateTime.ParseExact(RegisterDate, "M-d-yyyy", CultureInfo.InvariantCulture); RegisterDate = _date.ToString("yyyy-MM-dd");

answered May 25, 2013 at 8:35

John Woo

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4 Comments

Ted Over a year ago

you have an error, the format should be d-M-yyyy. the string date isn't in US format

Nave Tseva Over a year ago

Hi, thank you, but I get this error message "The name 'CultureInfo' does not exist in the current context "

Joey Over a year ago

Press Ctrl+. and select one of the options. Or put using System.Globalization; in your source file.

Martin Liversage Over a year ago

This assumes that the string represents a date which probably is a safe assumption given the name RegisterDate.

Martin Liversage · Accepted Answer · 2013-05-25 08:36:49Z

There are many ways to do what you want. Here I split the string into the three parts between the dashes, reverse it and then rejoin the parts again:

var registerDate = "25-5-2013"; registerDate = String.Join("-", registerDate.Split('-').Reverse());

If the string represents a date you can also use date parsing and formatting methods. Another option is to use regular expressions.

Abdullah Shoaib · Accepted Answer · 2013-05-25 08:37:34Z

Use split: this way

string[] dateItems = RegisterDate.Split('-'); RegisterDate = dateItems[2] + "-" +dateItems[1] + "-" + dateItems[0];

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