Java DateUtil current day, this week, this month time acquisition method

import org.springframework.util.StringUtils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

/**
* Time operation Tool class
*
* @author zys
*
*/
public class Time {

    /**
     * Get today's time range
     * @return returns a collection of strings of length 2, such as: [2017-11-03 00:00:00, 2017 -11-03 24:00:00]
     */
    public static List<String> getTodayRange() {
        List<String> dataList = new ArrayList<>(2);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd") ;
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.DATE, 0);
        String today = dateFormat.format(calendar.getTime());
        dataList.add(today + " 00:00:00");
        dataList.add(today + " 24:00:00");
        return dataList;
    }

    /**
     * Get yesterday's time range
     * @return returns a collection of strings of length 2, Such as: [2017-11-02 00:00:00, 2017-11-02 24:00:00]
     */
    public static List<String> getYesterdayRange() {
        List<String> dataList = new ArrayList<>(2) ;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.DATE, -1);
        String yesterday = dateFormat.format(calendar.getTime());
        dataList.add( yesterday + " 00:00:00");
        dataList.add(yesterday + " 24:00:00");
        return dataList;
    }

    /**
     * Get the time range of this week
     * @return returns a string of length 2 Collection, such as: [2017-10-30 00:00:00, 2017-11-05 24:00:00]
     */
    public static List<String> getCurrentWeekRange() {
        List<String> dataList = new ArrayList<>( 2);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.MONDAY);//Set Monday as the first day of the week
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.DAY_OF_WEEK, Calendar .MONDAY);
        String monday = dateFormat.format(calendar.getTime()) + " 00:00:00";
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        String sunday = dateFormat.format(calendar.getTime( )) + " 24:00:00";
        dataList.add(monday);
        dataList.add(sunday);
        return dataList;
    }
    /**
     * Get the time range of this week (without hours, minutes and seconds)
     * @return returns the length A collection of strings of 2, such as: [2017-10-30, 2017-11-05]
     */
    public static List<String> getCurrentWeekRangeNoTime() {
        List<String> dataList = new ArrayList<>(2);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.MONDAY);//设置周一为一周之内的第一天
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        String monday = dateFormat.format(calendar.getTime());
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        String sunday = dateFormat.format(calendar.getTime());
        dataList.add(monday);
        dataList.add(sunday);
        return dataList;
    }

    /**
     * Get the time range of this month
     * @return returns a string collection of length 2, such as: [2017-11-01 00:00:00, 2017-11-30 24:00:00 ]
     */
    public static List<String> getCurrentMonthRange() {
        List<String> dataList = new ArrayList<>(2);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance() ;
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        String firstDayOfMonth = dateFormat.format(calendar.getTime()) + " 00 :00:00";
        calendar.add(Calendar. MONTH, 1);
        calendar.set(Calendar.DAY_OF_MONTH, 0);
        String lastDayOfMonth = dateFormat.format(calendar.getTime()) + " 24:00:00";
        dataList.add(firstDayOfMonth);
        dataList.add(lastDayOfMonth);
        return dataList;
    }

    /**
     * Get the time range of the current year
     * @return returns a string set of length 2, such as: [2017-01-01 00:00:00, 2017-12-31 24:00:00]
     */
    public static List<String> getCurrentYearRange() {
        List<String> dataList = new ArrayList<>(2);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();
        calendar. setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.YEAR, 0);
        calendar.set(Calendar.DAY_OF_YEAR, 1);
        String firstDayOfYear = dateFormat.format(calendar.getTime()) + " 00:00:00";
        calendar.add(Calendar. YEAR, 1);
        calendar.set(Calendar.DAY_OF_YEAR, 0);
        String lastDayOfYear = dateFormat.format(calendar.getTime()) + " 24:00:00";
        dataList.add(firstDayOfYear);
        dataList.add(lastDayOfYear );
        return dataList;
    }

    /**
     * Get the time range of the last few days
     * @param lastFewDays How many days are the last
     * @return Returns a string set of length 2, such as: [2017-12-25 17:15:33, 2017-12-26 17:15:33]
     */
    public static List<String> getLastFewDaysRange(int lastFewDays) {
        List<String> dataList = new ArrayList<>(2);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        String endTime = dateFormat.format(calendar.getTime());
        calendar.add(Calendar.DATE, -lastFewDays);
        String startTime = dateFormat.format(calendar.getTime());
        dataList.add(startTime);
        dataList.add(endTime);
        return dataList;
    }

    /**
     * 获取当前时间
     * @param pattern specifies the format for returning the current time, for example: "yyyy-MM-dd HH:mm:ss"
     * @return returns the current time in the specified format, for example: "2018-01-25 10:14:30"
     * /
    public static String getCurrentTime(String pattern) {
        String currentTime;
        SimpleDateFormat dateFormat = new SimpleDateFormat(pattern);
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        currentTime = dateFormat.format(calendar. getTime());
        return currentTime;
    }

    /***
     * Offset the specified time by a few hours
     * @param time specifies the time, accurate to minutes, for example: "2018-01-25 10:48"
     * @param offset offset Amount: Negative number means minus several hours, positive number means add several hours, for example: 1
     * @return returns the time after the offset, such as: "2018-01-25 11:48"
     * @throws ParseException
     */
    public static String offsetHours(String time, int offset) throws ParseException {
        String offsetHours = null;
        if (StringUtils .hasText(time)) {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(dateFormat.parse(time));
            calendar.add( Calendar.MINUTE, offset);
            offsetHours = dateFormat.format(calendar.getTime());
        }
        return offsetHours;
    }

    /**
     * Offset the specified month by several months
     * @param month specifies the month
     * @param offset offset: negative number represents the previous month, positive number represents the next month
     * @return returns the month after the offset, such as: 2018-01
     * @throws ParseException
     */
    public static String offsetMonths(String month, int offset) throws ParseException {
        String offsetMonth = null;
        if (StringUtils.hasText(month)) {
           SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
           Calendar calendar = Calendar.getInstance();
           calendar.setTime(dateFormat.parse(month));
           calendar.add(Calendar.MONTH, offset);
           offsetMonth = dateFormat.format(calendar.getTime());
        }
        return offsetMonth;
    }

    /**
     * Get the day of the week for the specified date (set Monday as the start of the week)
     * @param day specifies the date
     * @return returns the day of the week, such as: 1
     * @throws ParseException
     */
    public static int getDayOfWeek(String day) throws ParseException {
        int dayOfWeek = 0;
        if (StringUtils.hasText(day)) {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(dateFormat.parse( day));
            calendar.add(Calendar.DATE, -1); //Subtract one day from the specified date to meet Chinese habits
            dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
        }
        return dayOfWeek;
    }

    /**
     * 获取指定月份有多少天
     * @param month 指定月份
     * @return 返回天数，如：31
     * @throws ParseException
     */
    public static int getDaysInMonth(String month) throws ParseException {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(dateFormat.parse(month));
        calendar.add(Calendar.MONTH, 1);
        calendar.set(Calendar.DAY_OF_MONTH, 0);
        return calendar.get(Calendar.DAY_OF_MONTH);
    }

}