java - 在java中将日期转换为字符串？

Question

在我的代码中，我将日期作为这个字符串：

date="2013-06-15"

我希望它转换为 15 Jun 2013 。我试过dateFormat：

DateFormat df = new SimpleDateFormat("yyyy-mm-dd");
String date = df.format(det);   
DateFormat f2 = new SimpleDateFormat("dd-mmmm-yyyy");
date=f2.format(date).toLowerCase();
out.println("DATE"+date); 

但它给出了空指针，任何人都可以帮我这样做。请帮忙吗？

Answer 1

String dateString="2013-06-15";
Date date = new SimpleDateFormat("yyyy-MM-dd").parse(dateString);
DateFormat df = new SimpleDateFormat("dd-MMM-yyyy");
DateFormat df2 = new SimpleDateFormat("dd MMM yyyy");
System.out.println(df.format(date).toLowerCase());//print 15-jun-2013
System.out.println(df.format(date));//print 15-Jun-2013
System.out.println(df2.format(date));//print 15 Jun 2013

Answer 2

首先将您的日期字符串转换为日期，然后将其转换为您所需的格式

package naveed.workingfiles;

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

public class DateToString {

public static void main(String[] args) {

String laDate="2013-06-15";
String dateString = laDate.substring(8, 10) + "/"
            + laDate.substring(5, 7) + "/"
            + laDate.substring(0, 4);
Date date= new SimpleDateFormat("dd/MM/yyyy").parse(dateString);
String dateFormat = "dd-MMM-yyyy";
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat, new Locale("en_US"));
String tDate = sdf.format(date);
System.out.println(tDate);//here your String date 

}

}

Answer 3

// Create an instance of SimpleDateFormat used for formatting 
// the string representation of date (month/day/year)
DateFormat df = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");

// Get the date today using Calendar object.
Date today = Calendar.getInstance().getTime();        
// Using DateFormat format method we can create a string 
// representation of a date with the defined format.
String reportDate = df.format(today);

// Print what date is today!
System.out.println("Report Date: " + reportDate);

Answer 4

这是行不通的：format()不接受字符串参数：

String date = df.format(det);   
DateFormat f2 = new SimpleDateFormat("dd-mmmm-yyyy");
date=f2.format(date).toLowerCase();

尝试这个：

String dateAsString = "2013-06-15"
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date date = df.parse(dateAsString);   
df = new SimpleDateFormat("dd MMM yyyy");
out.println("DATE"+df.format(date)); 

Answer 5

这将起作用

    String dateStr = "2013-06-15";
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    Date date=df.parse(dateStr);
    DateFormat f2 = new SimpleDateFormat("dd-MMM-yyyy");
    System.out.println(f2.format(date));