【时间工具】整理下java时间换算专题

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首先总结了一下日期转换基础，最常用的两个工具类Date与calender，转换方法如下：

package com.zzt.spider;import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/*** 时间工具总结* @author ZX* @date 2018年4月20日**/
public class TestTime {public static void main(String[] args) {//date 与calandartry{//首先是Date的格式化与反格式化。yyyy-MM-dd HH:mm:ss 分别对应 年-月-日 时：分：秒//"HH:mm:ss"是24小时制的，"hh:mm:ss"是12小时制。SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//日期的格式化转换Date now = new Date();String format = sdf.format(now);System.out.println(format);//结果：2018-05-02 16:51:13//String time = "2018-05-02 16:51:13";Date parse = sdf.parse(time);System.out.println(format);////获取时间戳Date date = new Date();long time1 = date.getTime();//获取时间戳方法//给日历设置date日期：Date d= new Date();Calendar calendar = Calendar.getInstance();calendar.setTime(d);//给日历设置自定义日期：Calendar calendar2 = Calendar.getInstance();calendar2.set(Calendar.YEAR,2018);calendar2.set(Calendar.MONTH,11);//月份是从0开始的，所以11代表十二月calendar2.set(Calendar.DAY_OF_MONTH,20);////日历转dateDate calendar2Date = calendar2.getTime();String calendar2String = sdf.format(calendar2Date);System.out.println(">>>>>>>>>>"+calendar2String);//结果>>>>>>>>>>2018-12-20 17:20:12//间隔日期：Date date1 = new Date();Calendar cal = Calendar.getInstance();cal.setTime(date1);cal.add(Calendar.DATE,1);Date date2 = cal.getTime();long leftTime =  date2.getTime()-date1.getTime();System.out.println("时间戳间隔"+leftTime);//将时间戳间隔转换成时分秒，正在写。。Long hh=leftTime/(1000*60*60);Long mm=leftTime%(1000*60*60);String betueenTime=hh+"小时"+mm+"分";//倒计时：}catch (Exception e){}}
}

工具类：计算间隔时分秒：

package com.zzt.spider;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/*** 时间工具总结* @author ZX* @date 2018年4月20日**/
public class TestTime {public static void main(String[] args) throws ParseException {//测试SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String timeStr1="2018-04-01 12:30:10";String timeStr2="2018-04-02 13:31:20";Date date1 = sdf.parse(timeStr1);Date date2 = sdf.parse(timeStr2);String dateBetween = dateBetween(date1, date2);System.out.println(dateBetween);}/*** * @param startDate 开始date* @param endDate   结束date* @return*/public static String dateBetween(Date startDate, Date endDate) {java.util.Calendar calStart = java.util.Calendar.getInstance();java.util.Calendar calEnd = java.util.Calendar.getInstance();calStart.setTime(startDate);calEnd.setTime(endDate);long diffMill = calEnd.getTime().getTime() - calStart.getTime().getTime();System.out.println("间隔的毫秒数："+diffMill);long rtn = 0;return formatTime(diffMill);}/* * 毫秒转化时分秒毫秒 */  public static String formatTime(Long ms) {  Integer ss = 1000;  Integer mi = ss * 60;  Integer hh = mi * 60;  Integer dd = hh * 24;  Long day = ms / dd;  Long hour = (ms - day * dd) / hh;  Long minute = (ms - day * dd - hour * hh) / mi;  Long second = (ms - day * dd - hour * hh - minute * mi) / ss;  Long milliSecond = ms - day * dd - hour * hh - minute * mi - second * ss;  StringBuffer sb = new StringBuffer();  if(day > 0) {  sb.append(day+"天");  }  if(hour > 0) {  sb.append(hour+"小时");  }  if(minute > 0) {  sb.append(minute+"分");  }  if(second > 0) {  sb.append(second+"秒");  }  if(milliSecond > 0) {  sb.append(milliSecond+"毫秒");  }  return sb.toString();  }  public static Long dateDiff(Date sDate, Date eDate, int diffType) {java.util.Calendar calst = java.util.Calendar.getInstance();java.util.Calendar caled = java.util.Calendar.getInstance();calst.setTime(sDate);caled.setTime(eDate);long diffMill = caled.getTime().getTime() - calst.getTime().getTime();System.out.println("diffMill"+diffMill);long rtn = 0;switch (diffType) {case Calendar.MILLISECOND:rtn = diffMill;break;case Calendar.SECOND:rtn = diffMill / 1000;break;case Calendar.MINUTE:rtn = diffMill / 1000 / 60;break;case Calendar.HOUR:rtn = diffMill / 1000 / 3600;break;case Calendar.DATE:rtn = diffMill / 1000 / 60 / 60 / 24;break;case Calendar.MONTH:rtn = diffMill / 1000 / 60 / 60 / 24 / 12;break;case Calendar.YEAR:rtn = diffMill / 1000 / 60 / 60 / 24 / 365;break;}return rtn;}
}

获取某月第一天与最后一天：

/** 
* 获得该月第一天 
* @param year 
* @param month 
* @return 
*/  
public static String getFirstDayOfMonth(int year,int month){  Calendar cal = Calendar.getInstance();  //设置年份  cal.set(Calendar.YEAR,year);  //设置月份  cal.set(Calendar.MONTH, month-1);  //获取某月最小天数  int firstDay = cal.getActualMinimum(Calendar.DAY_OF_MONTH);  //设置日历中月份的最小天数  cal.set(Calendar.DAY_OF_MONTH, firstDay);  //格式化日期  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  String firstDayOfMonth = sdf.format(cal.getTime());  return firstDayOfMonth;  }  

/*** 获取某年某月的最后一天* @param year* @param month* @return*/public static String getLatDayOfMonth(int year ,int month) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar cal = Calendar.getInstance();//设置年份/*	cal.set(Calendar.YEAR,year);//设置月份cal.set(Calendar.MONTH, month-1);*///获取某月最大天数// int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);//设置日历中月份的最大天数// cal.set(Calendar.DAY_OF_MONTH, lastDay);//格式化日期cal.set(year, month-1, 1);cal.roll(Calendar.DATE, -1);String lastDayOfMonth = sdf.format(cal.getTime());return lastDayOfMonth;}

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