DateUtils 时间日期处理类

时间日期处理类

有时候会遇到31日执行日历类 去取当月的最后一天会发现到了下月的第一天
比如7月31日 去计算 月份的最后一天 发现有31天的到了要下个月的一号了

package com.zoomlion.dataCollector.utils;

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

public abstract class DateUtils {

    private static final String DEFAULT_PATTERN = "yyyyMMddhhmmss";

    public static String getSystemDate() {
        return formatDate(getSysDateTime(), DEFAULT_PATTERN);
    }

    public static String formatDate(Date date, String pattern){
        DateFormat df = new SimpleDateFormat(pattern);
        return df.format(date);
    }

    public static Date parseDate(String dateStr, String pattern){
        DateFormat df = new SimpleDateFormat(pattern);
        try {
            return df.parse(dateStr);
        } catch (ParseException e) {
            throw new RuntimeException("Error while parse date", e);
        }
    }

    public static Date getSysDateTime(){
        return new Date();
    }

    public static Date getSysDate(){
        return getDate(getSysDateTime());
    }

    public static Date getDate(Date date){
        if (date == null) return null;
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }

    public static Date add(Date date, int dateField, int mount){
        if (date == null) return null;
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(dateField, mount);

        return cal.getTime();
    }

    public static int getYear(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.YEAR);
    }

    public static int getMonth(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.MONTH)+1;
    }

    public static int getDayOfMonth(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.DAY_OF_MONTH);
    }

    /**
     * Sunday=1
     * SATURDAY=7
     * @param date
     * @return
     */
    public static int getDayOfWeek(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.DAY_OF_WEEK);
    }

    public static int getDayOfYear(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.DAY_OF_YEAR);

    }

    public static int getHour(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.HOUR_OF_DAY);
    }

    public static int getMinute(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.MINUTE);
    }

    public static int getSecond(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.SECOND);
    }

    public static int getMillSecond(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.MILLISECOND);
    }

    public static Timestamp getTimestamp(Date date){
        return new Timestamp(date.getTime());
    }

    public static java.sql.Date getSqlDate(Date date){
        return new java.sql.Date(date.getTime());
    }

    public static Date getDate(int year, int month, int day){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month-1);
        cal.set(Calendar.DAY_OF_MONTH, day);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }

    public static Date getDate(int year, int month, int day, int hour, int min, int second){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month-1);
        cal.set(Calendar.DAY_OF_MONTH, day);
        cal.set(Calendar.HOUR_OF_DAY, hour);
        cal.set(Calendar.MINUTE, min);
        cal.set(Calendar.SECOND, second);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    public static Date getFirstDateOfMonth(int year, int month){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month-1);
        cal.set(Calendar.DAY_OF_MONTH, 1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }

    public static Date getLastDateOfMonth(int year, int month){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month);
        //cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.DAY_OF_MONTH, 1);//设置该月1号
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        cal.add(Calendar.DATE, -1);//使用add减一天

        return cal.getTime();
    }


    public static Date getFirstDateOfYear(int year){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.DAY_OF_YEAR, 1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }

    public static Date getLastDateOfYear(int year){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.DAY_OF_YEAR, cal.getActualMaximum(Calendar.DAY_OF_YEAR));
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }

    public static Date getPreviousDate(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH)-1);
        return cal.getTime();
    }

    public static Date getNextDate(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH)+1);
        return cal.getTime();
    }

    public static Date getFirstDateOfMonth(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        return getFirstDateOfMonth(year, month);
    }

    public static Date getLastDateOfMonth(Date date){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH);
        return getLastDateOfMonth(year, month);
    }

    /**
     * 获得给定日期当周的WeekDay
     * @param date
     * @param weekOfDay     星期一是1，星期天是7
     * @return
     */
    public static Date getWeekDate(Date date, int weekOfDay){
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        if (weekOfDay < 7){
            cal.set(Calendar.DAY_OF_WEEK, weekOfDay+1);
        }else{
            cal.set(Calendar.DAY_OF_WEEK, weekOfDay);//星期六
            cal.add(Calendar.DATE, weekOfDay-6);//往后推一天到周日
        }
        return cal.getTime();
    }

    /**
     * 两个时间相差毫秒数
     * @param start
     * @param end
     * @return
     */
    public static Long minusMilliseconds(Date start, Date end){
        if (start.after(end)){//交换
            Date tmp = start;
            start = end;
            end = tmp;
        }

        return end.getTime()-start.getTime();
    }

    public static Long minusSeconds(Date start, Date end){

        return minusMilliseconds(start, end)/1000;
    }

    public static Long minusMinutes(Date start, Date end){
        return minusMilliseconds(start, end)/(1000*60);
    }

    public static Long minusHours(Date start, Date end){
        return minusMilliseconds(start, end)/(1000*60*60);
    }

    public static Long minusDay(Date start, Date end){
        return minusMilliseconds(start, end)/(1000*60*60*24);
    }

}