human-resources-server/src/main/java/com/jingcheng/cms/util/DateUtils.java

package com.jingcheng.cms.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @author
 * @description
 * @create 2018-07-05 13:36
 **/


public class DateUtils {


    public static Date date() {

        return Calendar.getInstance().getTime();
    }


    public static String startTime() {

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MONTH, 3);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(calendar.getTime());
    }

    public static String startTimeStamp() {

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MONTH, 3);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        String timeStampStr = String.valueOf(calendar.getTimeInMillis());
        return timeStampStr.substring(0, timeStampStr.length() - 3);
    }

    public static String endTime() {

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 30);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MONTH, 3);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(calendar.getTime());
    }

    public static String endTimeStamp() {

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 30);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MONTH, 3);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);

        String timeStampStr = String.valueOf(calendar.getTimeInMillis());

        return timeStampStr.substring(0, timeStampStr.length() - 3);
    }

    public static String timeStampToStr(String timeStampStr) {


        Long timeStamp = Long.parseLong(timeStampStr);
        timeStamp = timeStamp * 1000L;
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(timeStamp);
        return formatDate(calendar.getTime());
    }

    public static String formatDate(Date date) {


        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(date);
    }

    public static String curDateTimeString() {

        Date date = Calendar.getInstance().getTime();
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return df.format(date);
    }

    public static Date curDateTime() {

        return Calendar.getInstance().getTime();
    }

    public static  Date parse(String strDate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        return sdf.parse(strDate);
    }

    public static  int getAge(Date birthDay) {
        Calendar cal = Calendar.getInstance();
        if (birthDay == null || cal.before(birthDay)) { //出生日期晚于当前时间，无法计算
            return 0;
        }
        int yearNow = cal.get(Calendar.YEAR);  //当前年份
        int monthNow = cal.get(Calendar.MONTH);  //当前月份
        int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH); //当前日期
        cal.setTime(birthDay);
        int yearBirth = cal.get(Calendar.YEAR);
        int monthBirth = cal.get(Calendar.MONTH);
        int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
        int age = yearNow - yearBirth;   //计算整岁数
        if (monthNow <= monthBirth) {
            if (monthNow == monthBirth) {
                if (dayOfMonthNow < dayOfMonthBirth) age--;//当前日期在生日之前，年龄减一
            }else{
                age--;//当前月份在生日之前，年龄减一
            }
        }
        return age;
    }

    public static void main(String[] args) throws ParseException {

        System.out.println(DateUtils.getAge(DateUtils.parse("1996-08-28")));
    }

}