java获取当前日期的前一天日期与字符串日期之间的转换

Java

util

Calendar

类，再用Calendar的getTime()方法生成对应的Date，最后用SimpleDateFormat输出。

import 

java.util.Calendar;

public class 

Main{

public static void 

main(String[] args){

Calendar now = Calendar.getInstance();

System.out.println(

"Current Year is : "

+ now.get(Calendar.YEAR));

// month start from 0 to 11

System.out.println(

"Current Month is : "

+ (now.get(Calendar.MONTH) +

1

));

System.out.println(

"Current Date is : "

+ now.get(Calendar.DATE));

}

}

Calendar calendar = Calendar.getInstance();//

此时打印它获取的是系统当前时间

calendar.add(Calendar.DATE, -1); //

得到前一天

String yestedayDate

= new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());

calendar.add(Calendar.MONTH, -1); //

得到前一个月

int year = calendar.get(Calendar.YEAR);

int month = calendar.get(Calendar.MONTH)+1; //

输出前一月的时候要记得加

1

String date = "2010-02-01 23:59:59";

SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

try

{

Date d = sf.parse(date);

System.out.println(sf.format(d));

} catch (ParseException e){

e.printStackTrace();

}