java日期时间基本操作方法
1. 获得Calendar实例:Calendar c = Calendar.getInstance();
2. 定义日期/时间的`格式:SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
3. 把日期/时间转换成固定格式,使用SimpleDateFormat的format()方法:
String datetime = sdf.format(c.getTime());
4. 把字符串转换成日期/时间,使用SimpleDateFormat的parse()方法:Date d = sdf3.parse("2016-08-08 16:43:00");
5. 日期/时间的增加,减少,使用Calendar的add()方法,如将日期减少100天:c.add(Calendar.DATE, -100);
6. 日期/时间的设置,使用Calendar的set()方法,如将小时设置为0时:
c.set(Calendar.HOUR_OF_DAY, 0);
例子:
package myCalendar;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class myCalendar { public static void main(String args[]) throws Exception{ Calendar c = Calendar.getInstance(); SimpleDateFormat sdf1 =new SimpleDateFormat("yyyyMMdd"); SimpleDateFormat sdf2 =new SimpleDateFormat("HHmmss"); SimpleDateFormat sdf3 =new SimpleDateFormat("yyyyMMddHHmmss"); SimpleDateFormat sdf4 =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date = sdf1.format(c.getTime()); System.out.println(date); String time = sdf2.format(c.getTime()); System.out.println(time); String dt = "20160808162405"; Date d = sdf3.parse(dt); dt = sdf4.format(d); c.setTime(d); c.add(Calendar.DATE, -100); c.set(Calendar.HOUR_OF_DAY, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0); System.out.println("100天前:" + sdf4.format(c.getTime())); c.add(Calendar.DATE, 200); c.set(Calendar.HOUR_OF_DAY, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0); System.out.println("100天后:" + sdf4.format(c.getTime())); }}
【java日期时间基本操作方法】相关文章：