java 对时间的操作（全）

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);

    }
}