获取指定日期月份的开始时间戳和结束时间戳

1.util

package com.etone.job.report.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class GetMontnUtil {
    /**
     *
     * @param minDate 最小时间  2015-01
     * @param maxDate 最大时间 2015-10
     * @return 日期集合 格式为 年-月
     * @throws Exception
     */
    public static List<String> getMonthBetween(String minDate, String maxDate) throws Exception {
        ArrayList<String> result = new ArrayList<String>();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");//格式化为年月

        Calendar min = Calendar.getInstance();
        Calendar max = Calendar.getInstance();

        min.setTime(sdf.parse(minDate));
        min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);

        max.setTime(sdf.parse(maxDate));
        max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);

        Calendar curr = min;
        while (curr.before(max)) {
            result.add(sdf.format(curr.getTime()));
            curr.add(Calendar.MONTH, 1);
        }

        return result;
    }

    /**
     * 获取指定日期所在月份开始的时间戳
     * @param date 指定日期
     * @return
     */
    public static Long getMonthBegin(String date) throws ParseException {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Date time = format.parse(date);
        Calendar c = Calendar.getInstance();
        c.setTime(time);

        //设置为1号,当前日期既为本月第一天
        c.set(Calendar.DAY_OF_MONTH, 1);
        //将小时至0
        c.set(Calendar.HOUR_OF_DAY, 0);
        //将分钟至0
        c.set(Calendar.MINUTE, 0);
        //将秒至0
        c.set(Calendar.SECOND,0);
        //将毫秒至0
        c.set(Calendar.MILLISECOND, 0);
        // 获取本月第一天的时间戳
        return c.getTimeInMillis();
    }

    /**
     * 获取指定日期所在月份结束的时间戳
     * @param date 指定日期
     * @return
     */
    public static Long getMonthEnd(String date) throws ParseException {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Date time = format.parse(date);
        Calendar c = Calendar.getInstance();
        c.setTime(time);

        //设置为当月最后一天
        c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
        //将小时至23
        c.set(Calendar.HOUR_OF_DAY, 23);
        //将分钟至59
        c.set(Calendar.MINUTE, 59);
        //将秒至59
        c.set(Calendar.SECOND,59);
        //将毫秒至999
        c.set(Calendar.MILLISECOND, 999);
        // 获取本月最后一天的时间戳
        return c.getTimeInMillis();
    }
}

实例

try {
            Long monthBegin = GetMontnUtil.getMonthBegin("2019-05-22");
            Long monthEnd = GetMontnUtil.getMonthEnd("2019-05-22");
            System.out.println("monthBegin:" + monthBegin);
            System.out.println("monthEnd:" + monthEnd);
        } catch (ParseException e) {
            e.printStackTrace();
        }

结果，十三位要自己处理为十位的时间戳

monthBegin:1556640000000
monthEnd:1559318399999