Java Formatting Date

问题

I am trying to get the current date and format it however i am getting an invalid month of 59. Under is the code

Code

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

DateFormat df = new SimpleDateFormat("yyyy-mm-dd");
Date todayDate = new Date();

String formatDate = df.format(todayDate);

Output is 2013-59-07

回答1:

You need "MM" for month. "mm" is for minutes.

See http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html

回答2:

You have used mm which means minutes. Use capital MM instead.

You can find all date and time pattern symbols on the SimpleDateFormat Javadoc page.

回答3:

You need to use capital MM and not mm. Lower case 'mm' is for minutes and not for months.

So, your code would be :

DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

回答4:

Month is retrieved by MM, not mm.

DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

Refer to SimpleDateFormat JavaDoc:

M Month in year

回答5:

DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
String dt = dateFormat.format(cal.getTime());

Use MM instead of mm.

来源：https://stackoverflow.com/questions/16424667/java-formatting-date