java 对时间的操作（全）

末蓝、 2022-05-15 14:37 234阅读 0赞

package com.mryt.cps.oms.center.util;
    
    import java.text.DateFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.HashMap;
    import java.util.Map;
    
    public class DateUtil {
        public static final SimpleDateFormat startFormat = new SimpleDateFormat("yyyy-MM-dd 00:00:00");
    
        public static final SimpleDateFormat endFormat = new SimpleDateFormat("yyyy-MM-dd 23:59:59");
    
        public static final SimpleDateFormat formatDateYMDHHMMSS = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
        public static final SimpleDateFormat yearAndMonthFormat = new SimpleDateFormat("yyyy-MM");
    
        public static final SimpleDateFormat formatDateYMD = new SimpleDateFormat("yyyy-MM-dd");
    
        /**
         * 获得当天0点时间
         */
        public static Date getTimesmorning() {
            Calendar cal = Calendar.getInstance();
            cal.set(Calendar.HOUR_OF_DAY, 0);
            cal.set(Calendar.SECOND, 0);
            cal.set(Calendar.MINUTE, 0);
            cal.set(Calendar.MILLISECOND, 0);
            return cal.getTime();
        }
    
        /**
         * 获得本周一0点时间
         */
        public static Date getTimesWeekmorning() {
            Calendar cal = Calendar.getInstance();
            /** 判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了*/
            /*** 获得当前日期是一个星期的第几天*/
            int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
            if (1 == dayWeek) {
                cal.add(Calendar.DAY_OF_MONTH, -1);
            }
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            cal.setFirstDayOfWeek(Calendar.MONDAY);
            /** 获得当前日期是一个星期的第几天*/
            int day = cal.get(Calendar.DAY_OF_WEEK);
            cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);
            String monday=sdf.format(cal.getTime());
    
            try {
                return sdf.parse(monday);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return null;
        }
    
        /**
         * 获得本月第一天0点时间
         */
        public static Date getTimesMonthmorning() {
            Calendar cal = Calendar.getInstance();
            cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
            cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
            return cal.getTime();
        }
    
        /**
         * 返回当天日期和本月一号
         *
         * @return
         */
        public static Map<String, String> getNowDateAndMonthDate() {
            Map<String, String> map = new HashMap<>();
            Calendar cal = Calendar.getInstance();
            /***获取年份*/
            int year = cal.get(Calendar.YEAR);
            /**获取月份*/
            int month = cal.get(Calendar.MONTH) + 1;
            /***获取日*/
            int day = cal.get(Calendar.DATE);
            String nowDate = year + "-" + month + "-" + day;
            String monthStartDate = year + "-" + month + "-01";
            map.put("nowDate", nowDate);
            map.put("monthStartDate", monthStartDate);
            /**获取上个月的当前号日期**/
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Calendar c = Calendar.getInstance();
            c.setTime(new Date());
            c.add(Calendar.MONTH, -1);
            Date m = c.getTime();
            String mon = format.format(m);
            map.put("preMonthDate", mon);
            /**获取上个月的当前号日期**/
            return map;
        }
    
        /**
         * 计算本周一日期
         *
         * @return
         */
        public static String getMonDayDate() {
            Calendar cal = Calendar.getInstance();
            /** 判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了*/
            /*** 获得当前日期是一个星期的第几天*/
            int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
            if (1 == dayWeek) {
                cal.add(Calendar.DAY_OF_MONTH, -1);
            }
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            cal.setFirstDayOfWeek(Calendar.MONDAY);
            /** 获得当前日期是一个星期的第几天*/
            int day = cal.get(Calendar.DAY_OF_WEEK);
            cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);
            String weekTimeBegin = sdf.format(cal.getTime());
            return weekTimeBegin;
        }
    
        public static String todayFormatDate(Date date, SimpleDateFormat format) {
            return format.format(date);
        }
    
        public static String firstDayOfMonthFormatDate(Date date) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            calendar.add(Calendar.MONTH, 0);
            calendar.set(Calendar.DAY_OF_MONTH, 1);
            return startFormat.format(calendar.getTime());
        }
    
        public static String lastDayOfMonthFormatDate(Date date) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            calendar.add(Calendar.MONTH, 1);
            calendar.set(Calendar.DAY_OF_MONTH, 0);
            return endFormat.format(calendar.getTime());
        }
    
        public static void main(String args[]) throws Exception {
            Date now = new Date();
            String startTime = DateUtil.firstDayOfMonthFormatDate(now);
            String endTime = DateUtil.lastDayOfMonthFormatDate(now);
            System.out.println("startTime = "+startTime);
            System.out.println("endTime = "+endTime);
            String startTime1= DateUtil.todayFormatDate(DateUtil.yearAndMonthFormat.parse("2018-10"), DateUtil.startFormat);
    
            String endTime1 = DateUtil.todayFormatDate(DateUtil.yearAndMonthFormat.parse("2018-10"), DateUtil.endFormat);
            System.out.println(getLastOfMonthDateByStr(startTime1));
    
            //        String time = "2018-9-2";
    //        System.out.println("time = " + firstDayOfMonthFormatDate(yearAndMonthFormat.parse(time)));
    //        System.out.println("time = " + lastDayOfMonthFormatDate(yearAndMonthFormat.parse(time)));
        }
    
        /**
         * 根据日期返回字符串
         *
         * @param date
         * @return
         */
        public static String getStrByDate(Date date) {
            SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            if (date != null) {
                return sDateFormat.format(date);
            }
            return null;
        }
        public static String getLastOfMonthDateByStr(String strDate) throws  Exception{
            SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date=sDateFormat.parse(strDate);
            return lastDayOfMonthFormatDate(date);
    
        }
    }