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JAVA中的日期时间操作

程序员文章站 2022-03-09 21:45:32
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import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Calendar;
//当前时间

Calendar cal = Calendar.getInstance();

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String mDateTime=formatter.format(cal.getTime());

out.println(mDateTime);

out.println("<br>");

 //1年前日期

java.util.Date myDate=new java.util.Date();

long myTime=(myDate.getTime()/1000)-60*60*24*365;

myDate.setTime(myTime*1000);

String mDate=formatter.format(myDate);

out.println(mDate);

out.println("<br>");

 //明天日期

myDate=new java.util.Date();

myTime=(myDate.getTime()/1000)+60*60*24;

myDate.setTime(myTime*1000);

mDate=formatter.format(myDate);

out.println(mDate);

out.println("<br>");

 //两个时间之间的天数

SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");

java.util.Date date= myFormatter.parse("2003-05-1");

java.util.Date mydate= myFormatter.parse("1899-12-30");

long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);

out.println(day);

out.println("<br>");

 //加半小时

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

java.util.Date date1 = format.parse("2002-02-28 23:16:00");

long Time=(date1.getTime()/1000)+60*30;

date1.setTime(Time*1000);

String mydate1=formatter.format(date1);

out.println(mydate1);

out.println("<br>");

 //年月周求日期

SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E");

java.util.Date date2= formatter2.parse("2003-05 5 星期五");

SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd");

String mydate2=formatter3.format(date2);

out.println(mydate2);

out.println("<br>");

 //求是星期几

mydate= myFormatter.parse("2001-1-1");

SimpleDateFormat formatter4 = new SimpleDateFormat("E");

String mydate3=formatter4.format(mydate);

out.println(mydate3);

out.println("<br>");

//日期加减某些天、月、年

Calendar cal = Calendar.getInstance();//Get today´s date
cal.add(Calendar.DAY_OF_MONTH,20);
System.out.println("20 days later:"+cal.getTime());
cal.add(Calendar.DAY_OF_MONTH,-20);//Return back
cal.add(Calendar.MONTH,2);
System.out.println("2 month later:"+cal.getTime());
cal.add(Calendar.MONTH,-2);
cal.add(Calendar.YEAR,2);
System.out.println("2 years later:"+cal.getTime());
相关标签: time