(Java) Date工具类

package com.newpay.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.temporal.TemporalAdjusters;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class DateUtil {

    /**
     * 判断当前时间是否在[startTime, endTime]区间，注意时间格式要一致
     *
     * @param nowTime   当前时间
     * @param startTime 开始时间
     * @param endTime   结束时间
     * @return
     * @author zyu
     */
    public static boolean isEffectiveDate(Date nowTime, Date startTime, Date endTime) {
        if (nowTime.getTime() == startTime.getTime()
                || nowTime.getTime() == endTime.getTime()) {
            return true;
        }

        Calendar date = Calendar.getInstance();
        date.setTime(nowTime);

        Calendar begin = Calendar.getInstance();
        begin.setTime(startTime);

        Calendar end = Calendar.getInstance();
        end.setTime(endTime);

        if (date.after(begin) && date.before(end)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * 获取当月1号的时间戳
     *
     * @param timeStamp
     * @param timeZone
     * @return
     */
    public static Long getMonthStartTime(Long timeStamp, String timeZone) {
        Calendar calendar = Calendar.getInstance();// 获取当前日期
        calendar.setTimeZone(TimeZone.getTimeZone(timeZone));
        calendar.setTimeInMillis(timeStamp);
        calendar.add(Calendar.YEAR, 0);
        calendar.add(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTimeInMillis() / 1000;
    }


    /**
     * 获取前M天时间戳
     *
     * @param days 需要返回前几天
     * @return 例如：返回昨天 00:00:00时间戳,  days = 1
     */
    public static Long getMinusDays(Integer days) {
        ZonedDateTime ztime = LocalDate.now().minusDays(days).atStartOfDay(ZoneId.systemDefault());
        return ztime.toEpochSecond();
    }

    /**
     * 获取本月1号记录时间戳
     *
     * @return 例如：2020-01-01 00:00:00
     */
    public static int getMonthStartDate() {
        return (int) LocalDate.now()
                .with(TemporalAdjusters.firstDayOfMonth())
                .atStartOfDay()
                .atZone(ZoneId.systemDefault())
                .toEpochSecond();
    }

    /**
     * 获取本月最后一日
     *
     * @return 例如：2020-01-31 00:00:00
     */
    public static long getMonthEndDate() {
        return LocalDate.now()
                .atTime(00, 00, 00)
                .with(TemporalAdjusters.lastDayOfMonth())
                .atZone(ZoneId.systemDefault())
                .toEpochSecond();
    }

    /**
     * 获取上个月最后一天
     *
     * @return
     */
    public static long getLastMonthLastDate() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.add(Calendar.DATE, -1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime().getTime() / 1000;
    }


    /**
     * 获取上个月第一天
     *
     * @return
     */
    public static long getLastMonthFirstDate() {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, -1);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime().getTime() / 1000;
    }

    /**
     * 获取当前时间戳
     *
     * @return
     */
    public static long getNowTime() {
        return System.currentTimeMillis() / 1000;
    }


    /**
     * 获取今天凌晨零点零分零秒的时间戳
     *
     * @return
     */
    public static long getTodayZeroTimeTemp() {
        // 获取现在的时间毫秒数
        long current = System.currentTimeMillis();
        // 获取今天的零分零秒的毫秒数
        long zero = current / (1000 * 3600 * 24) * (1000 * 3600 * 24) - TimeZone.getDefault().getRawOffset();
        return zero / 1000;
    }


    /**
     * 获取昨天凌晨零点零分零秒的时间戳
     *
     * @return
     */
    public static long getLastDayTimeTemp() {
        long lastTimeTwmp = getTodayZeroTimeTemp() - (24 * 60 * 60);
        return lastTimeTwmp;
    }

    /**
     * 依据传入字符串 返回 unix 时间戳
     *
     * @param strTime
     * @return
     */
    public static long getUnixTime(String strTime) {
        String retTime = null;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date;
        try {
            date = dateFormat.parse(strTime);
            long unixTime = date.getTime();
            retTime = String.valueOf(unixTime);
            retTime = retTime.substring(0, 10);
        } catch (ParseException e) {
        }

        return Long.parseLong(retTime);
    }

    /**
     * 根据月份获取天数
     *
     * @param month 年和月 例:(2018-5)
     * @return count_day
     */
    public static int getCountDayByMonth(String month) {
        Calendar cld = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        try {
            cld.setTime(sdf.parse(month));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        int count_day = cld.getActualMaximum(Calendar.DAY_OF_MONTH);
        return count_day;
    }

    /**
     * 返回当前日期时间
     *
     * @return
     */
    public static String getCurrDate() {
        Date now = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String strDateNow = dateFormat.format(now);
        return strDateNow;
    }

    /**
     * 返回当前年
     *
     * @return 2018
     */
    public static String getCurrYearDate() {
        Date now = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");
        String strDateNow = dateFormat.format(now);
        return strDateNow;
    }

    /**
     * 返回当前年和月
     *
     * @return 2018
     */
    public static String getCurrMonthDate() {
        Date now = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
        String strDateNow = dateFormat.format(now);
        return strDateNow;
    }
}