太原论坛网站开发公司,wordpress创建注册页面,购物网站开发内容,wordpress 需登录才能前言#xff1a;对于新手程序员的我来说#xff0c;写业务代码是现在的日常#xff0c;在此过程中经常需要对日期时间进行处理#xff0c;我挑了几个较有用的日期处理函数分享给大家。正文#xff1a;1、将某格式的时间字符串转化成毫秒时间戳表示的字符串#xff1a;pub…前言对于新手程序员的我来说写业务代码是现在的日常在此过程中经常需要对日期时间进行处理我挑了几个较有用的日期处理函数分享给大家。正文1、将某格式的时间字符串转化成毫秒时间戳表示的字符串public static String dateTimeStrToMills(String dateTime,String format){String dateStr null;SimpleDateFormat sdf new SimpleDateFormat(format);Calendar calendar Calendar.getInstance();calendar.clear();try {Date d new Date();d sdf.parse(dateTime);calendar.setTime(d);dateStr calendar.getTimeInMillis()ms;} catch (ParseException e) {e.printStackTrace();}return dateStr;}测试例Testpublic void test1(){String date 2018-10-10 08:30:00;String format yyyy-MM-dd HH:mm:ss;String timeMS DateTimeUtils.dateTimeStrToMills(date,format);System.out.println(毫秒时间 timeMS);//毫秒时间1539131400000ms}2、获取某个月的天数public static int getDayNumOfMonth(int year,int month){Calendar calendar Calendar.getInstance();calendar.clear();calendar.set(year, month,0);return calendar.get(Calendar.DAY_OF_MONTH);}测试例Testpublic void test2(){int year 2018;int month 10;int dayNum DateTimeUtils.getDayNumOfMonth(year,month);System.out.println(dayNum: dayNum);//dayNum:31}3、获取某日、月、年前后的日期public static String getBeforeOrAfterDateType(int num,String date,String format,int timeType){SimpleDateFormat sdf new SimpleDateFormat(format);String resultDate ;Calendar calendar Calendar.getInstance();calendar.clear();try {Date d new Date();d sdf.parse(date);calendar.setTime(d);calendar.add(timeType, num);//一天的结束是第二天的开始resultDate sdf.format(calendar.getTime());} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}return resultDate;}测试例Testpublic void test3(){//获取某个月前面一个月int num -1;String date 2018-10;String format yyyy-MM;int timeType Calendar.MONTH;String resultDate DateTimeUtils.getBeforeOrAfterDateType(num,date,format,timeType);System.out.println(resultDate: resultDate);//resultDate:2018-09//获取某天几天后的日期num 3;date 2018-10-05;format yyyy-MM-dd;timeType Calendar.DAY_OF_MONTH;resultDate DateTimeUtils.getBeforeOrAfterDateType(num,date,format,timeType);System.out.println(resultDate: resultDate);//resultDate:2018-10-08}4、根据毫秒时间戳获得格式化后的日期public static String millisecondToDate(Long millisecond,String dateFormat){Date date new Date(millisecond);GregorianCalendar gc new GregorianCalendar();gc.setTime(date);SimpleDateFormat format new SimpleDateFormat(dateFormat);String sb format.format(gc.getTime());return sb;}测试例Testpublic void test4(){long mill 1539131400000l;String format yyyy-MM-dd HH:mm:ss;String date DateTimeUtils.millisecondToDate(mill,format);System.out.println(date: date);//date:2018-10-10 08:30:00}5、获取某月第一天public static String getFirstDayOfMonth(int year,int month){Calendar cal Calendar.getInstance();cal.set(Calendar.YEAR, year);cal.set(Calendar.MONTH, month-1);int firstDay cal.getActualMinimum(Calendar.DAY_OF_MONTH);cal.set(Calendar.DAY_OF_MONTH, firstDay);SimpleDateFormat sdf new SimpleDateFormat(yyyy-MM-dd);String firstDayOfMonth sdf.format(cal.getTime());return firstDayOfMonth;}测试例Testpublic void test5(){int year 2018;int month 11;String format yyyy-MM-dd;String date DateTimeUtils.getFirstDayOfMonth(year,month,format);System.out.println(date: date);//date:2018-11-01}6、获取某月最后一天public static String getLastDayOfMonth(int year,int month,String format){Calendar cal Calendar.getInstance();cal.clear();cal.set(Calendar.YEAR, year);cal.set(Calendar.MONTH, month-1);int lastDay 0;lastDay cal.getActualMaximum(Calendar.DAY_OF_MONTH);cal.set(Calendar.DAY_OF_MONTH, lastDay);SimpleDateFormat sdf new SimpleDateFormat(format);String lastDayOfMonth sdf.format(cal.getTime());return lastDayOfMonth;}测试例Testpublic void test6(){int year 2018;int month 11;String format yyyy-MM-dd;String date DateTimeUtils.getLastDayOfMonth(year,month,format);System.out.println(date: date);//date:2018-11-30}7、获取起止日期之间的所有字符串(可自定义间隔、格式、日期类型)public static ListgetDatesBetweenTwoDate(String begin,String end,int num,int timeType,String format){ListlDates;lDates new ArrayList();try {SimpleDateFormat sdf new SimpleDateFormat(format);Date beginDate sdf.parse(begin);Date endDate sdf.parse(end);lDates.add(sdf.format(beginDate));Calendar calendar Calendar.getInstance();calendar.setTime(beginDate);boolean bContinue true;while(bContinue){calendar.add(timeType, num);if(endDate.after(calendar.getTime())){lDates.add(sdf.format(calendar.getTime()));}else{break;}}lDates.add(sdf.format(endDate));} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}return lDates;}测试例Testpublic void test7(){String startDate 2018-10-10;String endDate 2018-10-15;String format yyyy-MM-dd;int num 1;int timeType Calendar.DAY_OF_MONTH;ListtimeList DateTimeUtils.getDatesBetweenTwoDate(startDate,endDate,num,timeType,format);System.out.println(timeList.toString());//[2018-10-10, 2018-10-11, 2018-10-12, 2018-10-13, 2018-10-14, 2018-10-15]}
