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c#date-format
mrd
mrd

Reputation: 2183

Format date using variable

Following gives output as 20121212.

DateTime dd = new DateTime(2012, 12, 12);
string val = String.Format("{0:yyyyMMdd}", dd);

And when the format is in a variable. Following does not give above output.

DateTime dd = new DateTime(2012, 12, 12);
string dateFormat = "yyyyMMdd";
string val = String.Format("{0}:{1}", dd, dateFormat);

How can can I achieve it using format in a variable as above?

Upvotes: 5

Views: 14337

Answers (6)

fred
fred

Reputation: 465

You can also use .ToString(string format)

DateTime dd = new DateTime(2012, 12, 12);
string strFormat = "yyyyMMdd";
string val = dd.ToString(strFormat);

Upvotes: 0

Tim Schmelter
Tim Schmelter

Reputation: 460038

Just use DateTime.ToString:

string val = dd.ToString( dateFormat );

You are confusing String.Format with your format string which does work only in this way {0:yyyyMMdd}.

Upvotes: 3

Soner Gönül
Soner Gönül

Reputation: 98740

Try with String.Format like this;

DateTime dt = new DateTime(2012, 12, 12);
string Format = "yyyyMMdd";
string yourstring = String.Format("{0:" + Format + "}", dt);
Console.WriteLine(yourstring);

Demo

Upvotes: 0

mathieu
mathieu

Reputation: 31192

You can use the DateTime.ToString(string) method :

DateTime dd = new DateTime(2012, 12, 12);
string dateFormat = "yyyyMMdd";
string val = dd.ToString(dateFormat);

Upvotes: 0

Rawling
Rawling

Reputation: 50104

The simplest way would just be

DateTime dd = new DateTime(2012, 12, 12);
string strFormat = "yyyyMMdd";
string val = dd.ToString(strFormat);

String.Format doesn't directly support variable format strings.

Upvotes: 2

Habib
Habib

Reputation: 223207

I believe you have the format in a string variable, May this is what you are looking for:

DateTime dd = new DateTime(2012, 12, 12);
string strFormat = "yyyyMMdd";
string val = String.Format("{0:"+ strFormat + "}", dd);

Upvotes: 3

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