Java自定义日期工具类

  cn.hutool
  hutool-all
  5.7.14

import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUnit;
import cn.hutool.core.date.DateUtil;

import java.util.Date;


public class DateUtils {

    
    public static Date stringConvertDate(String str, String format) {
        if ("yyyy-MM-dd HH:mm:ss".equals(format)) {
            return DateUtil.parse(str, "yyyy-MM-dd HH:mm:ss");
        }
        if ("yyyy-MM-dd".equals(format)) {
            return DateUtil.parse(str, "yyyy-MM-dd");
        }
        return null;
    }

    
    public static Date getNowDate() {
        return DateUtil.date();
    }

    
    public static String getNowDateStr(int type) {
        String str = "";
        if (type == 1) {
            //yyyy-MM-dd HH:mm:ss
            str = DateUtil.now();
        }
        if (type == 2) {
            //yyyy-MM-dd
            str = DateUtil.today();
        }
        return str;
    }

    
    public static int getYearOrMonthOrDay(String type) {
        Date date = DateUtil.date();
        if ("year".equals(type)) {
            //获得年的部分
            return DateUtil.year(date);
        }
        if ("month".equals(type)) {
            //获得月份，从0开始计数
            return DateUtil.month(date)+1;
        }
        return -1;
    }

    
    public static String addDay(Date date, int number) {
        DateTime dateTime = DateUtil.offsetDay(date, number);
        return DateUtil.formatDateTime(dateTime);
    }

    
    public static String addMonth(Date date, int number) {
        DateTime dateTime = DateUtil.offsetMonth(date, number);
        return DateUtil.formatDateTime(dateTime);
    }

    
    public static String addHour(Date date, int number) {
        DateTime dateTime = DateUtil.offsetHour(date, number);
        return DateUtil.formatDateTime(dateTime);
    }

    
    public static String addMinute(Date date, int number) {
        DateTime dateTime = DateUtil.offsetMinute(date, number);
        return DateUtil.formatDateTime(dateTime);
    }

    
    public static String addSecond(Date date, int number) {
        DateTime dateTime = DateUtil.offsetSecond(date, number);
        return DateUtil.formatDateTime(dateTime);
    }

    
    public static Date getYesterdayDate() {
        return DateUtil.yesterday();
    }

    
    public static String getYesterdayString() {
        DateTime yesterday = DateUtil.yesterday();
        return DateUtil.formatDateTime(yesterday);
    }

    
    public static Date getTomorrowDate() {
        return DateUtil.tomorrow();
    }

    
    public static String getTomorrowString() {
        DateTime tomorrow = DateUtil.tomorrow();
        return DateUtil.formatDateTime(tomorrow);
    }


    
    public static Date getLastWeekDate() {
        return DateUtil.lastWeek();
    }

    
    public static String getLastWeekString() {
        DateTime lastWeek = DateUtil.lastWeek();
        return DateUtil.formatDateTime(lastWeek);
    }

    
    public static Date getNextWeekDate() {
        return DateUtil.nextWeek();
    }

    
    public static String getNextWeekString() {
        DateTime nextWeek = DateUtil.nextWeek();
        return DateUtil.formatDateTime(nextWeek);
    }


    
    public static Date getLastMonthDate() {
        return DateUtil.lastMonth();
    }

    
    public static String getLastMonthString() {
        DateTime lastMonth = DateUtil.lastMonth();
        return DateUtil.formatDateTime(lastMonth);
    }


    
    public static Date getNextMonthDate() {
        return DateUtil.nextMonth();
    }

    
    public static String getNextMonthString() {
        DateTime nextMonth = DateUtil.nextMonth();
        return DateUtil.formatDateTime(nextMonth);
    }

    
    public static long getDateBetweenByDay(Date date1, Date date2) {
        return DateUtil.between(date1, date2, DateUnit.DAY);
    }

    
    public static long getDateBetweenByHour(Date date1, Date date2) {
        return DateUtil.between(date1, date2, DateUnit.HOUR);
    }

    
    public static long getDateBetweenByMinute(Date date1, Date date2) {
        return DateUtil.between(date1, date2, DateUnit.MINUTE);
    }

    
    public static long getDateBetweenBySecond(Date date1, Date date2) {
        return DateUtil.between(date1, date2, DateUnit.SECOND);
    }

    
    public static long getDateBetweenByWeek(Date date1, Date date2) {
        return DateUtil.between(date1, date2, DateUnit.WEEK);
    }

    
    public static String getDateBetweenMsg(Date beginDate, Date endDate) {
        return DateUtil.formatBetween(beginDate, endDate);
    }

    
    public static int getAge(String birthDay) {
        return DateUtil.ageOfNow(birthDay);
    }
}

    @Test
    void testDateUtils() {
        String str = "2022-04-29";
        Date date = DateUtils.stringConvertDate(str, "yyyy-MM-dd");
        System.out.println(date);

        Date nowDate = DateUtils.getNowDate();
        System.out.println("获取当前日期(Date类型)：" + nowDate);

        //获取当前日期(String类型)，格式：yyyy-MM-dd
        String nowDateStr = DateUtils.getNowDateStr(2);
        System.out.println("获取当前日期(字符串类型): " + nowDateStr);
        //获取当前日期(String类型)，格式：yyyy-MM-dd HH:mm:ss
        String nowDateStr1 = DateUtils.getNowDateStr(1);
        System.out.println("获取当前日期(字符串类型): " + nowDateStr1);

        int month = DateUtils.getYearOrMonthOrDay("month");
        System.out.println("获取当前时间月份：" + month);

        //date = "2022-04-29";
        System.out.println("给指定时间加天数："+DateUtils.addDay(date, 2));
        System.out.println("给指定时间加月数："+DateUtils.addMonth(date, 2));
        System.out.println("给指定时间加小时数："+DateUtils.addHour(date, 2));
        System.out.println("给指定时间加分钟数："+DateUtils.addMinute(date, 2));
        System.out.println("给指定时间加秒数："+DateUtils.addSecond(date, 2));

        System.err.println("昨天（返回日期类型）："+DateUtils.getYesterdayDate());
        System.err.println("昨天（返回字符串类型）："+DateUtils.getYesterdayString());
        System.err.println("明天（返回日期类型）："+DateUtils.getTomorrowDate());
        System.err.println("明天（返回字符串类型）："+DateUtils.getTomorrowString());
        System.err.println("上周（返回日期类型）："+DateUtils.getLastWeekDate());
        System.err.println("上周（返回字符串类型）："+DateUtils.getLastWeekString());
        System.err.println("下周（返回日期类型）："+DateUtils.getNextWeekDate());
        System.err.println("下周（返回字符串类型）："+DateUtils.getNextWeekString());
        System.err.println("上个月（返回日期类型）："+DateUtils.getLastMonthDate());
        System.err.println("上个月（返回字符串类型）："+DateUtils.getLastMonthString());
        System.err.println("下个月（返回日期类型）："+DateUtils.getNextMonthDate());
        System.err.println("下个月（返回字符串类型）："+DateUtils.getNextMonthString());

        String dateStr1 = "2017-04-12 00:33:00";
        Date date1 = DateUtil.parse(dateStr1);
        String dateStr2 = "2017-04-23 23:33:23";
        Date date2 = DateUtil.parse(dateStr2);
        System.out.println("相差的天数："+DateUtils.getDateBetweenByDay(date1, date2));
        System.out.println("相差的小时数："+DateUtils.getDateBetweenByHour(date1, date2));
        System.out.println("相差的分钟数："+DateUtils.getDateBetweenByMinute(date1, date2));
        System.out.println("相差的秒数："+DateUtils.getDateBetweenBySecond(date1, date2));
        System.out.println("相差的周数："+DateUtils.getDateBetweenByWeek(date1, date2));
        System.out.println("相差的时间："+DateUtils.getDateBetweenMsg(date1, date2));

        System.out.println("根据年月日获取年龄："+DateUtils.getAge("1996-06-28"));
    }