原创

Java 时间工具类

1、说明

      收藏自己使用到的各种时间操作的工具类,方便以后自己使用,只做记录。

2、code

package top.zywork.common.utils;

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


public class DateUtils {
    
    public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String MINUTE_PATTERN = "yyyy-MM-dd HH:mm";
    public static final String HOUR_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String DATE_PATTERN = "yyyy-MM-dd";
    public static final String MONTH_PATTERN = "yyyy-MM";
    public static final String YEAR_PATTERN = "yyyy";
    public static final String MINUTE_ONLY_PATTERN = "mm";
    public static final String HOUR_ONLY_PATTERN = "HH";
    
    /**
     * 日期相加减天数
     * @param date 如果为Null,则为当前时间
     * @param days 加减天数
     * @param includeTime 是否包括时分秒,true表示包含
     * @return
     * @throws ParseException 
     */
    public static Date dateAdd(Date date, int days, boolean includeTime) throws ParseException{
        if(date == null){
            date = new Date();
        }
        if(!includeTime){
            SimpleDateFormat sdf = new SimpleDateFormat(DateUtils.DATE_PATTERN);
            date = sdf.parse(sdf.format(date));
        }
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.DATE, days);
        return cal.getTime();
    }
    
    /**
     * 时间格式化成字符串
     * @param date Date 需要格式化的时间
     * @param pattern 指定格式化后的格式,如果为空,则为yyyy-MM-dd
     * @return
     * @throws ParseException
     */
    public static String dateFormat(Date date, String pattern) throws ParseException{
        if(StrUtils.isBlank(pattern)){
            pattern = DateUtils.DATE_PATTERN;
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.format(date);
    }
    
    /**
     * 字符串解析成时间对象
     * @param dateTimeString String类型的时间字符串
     * @param pattern 字符串的时间格式,如果为空,则为yyyy-MM-dd
     * @return
     * @throws ParseException
     */
    public static Date dateParse(String dateTimeString, String pattern) throws ParseException{
        if(StrUtils.isBlank(pattern)){
            pattern = DateUtils.DATE_PATTERN;
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.parse(dateTimeString);
    }
    
    /**
     * 将日期时间格式成只有日期的字符串(可以直接使用dateFormat,Pattern为Null进行格式化)
     * @param dateTime Date 需要格式话的时间日期
     * @return
     * @throws ParseException
     */
    public static String dateTimeToDateString(Date dateTime) throws ParseException{
        String dateTimeString = dateFormat(dateTime, DATE_TIME_PATTERN);  
        return dateTimeString.substring(0, 10); 
    }
    
    /**
     * 当时、分、秒为00:00:00时,将日期时间格式成只有日期的字符串,
     * 当时、分、秒不为00:00:00时,直接返回
     * @param dateTime Date
     * @return
     * @throws ParseException
     */
    public static String dateTimeToDateStringIfTimeEndZero(Date dateTime) throws ParseException{
        String dateTimeString = DateUtils.dateFormat(dateTime, DateUtils.DATE_TIME_PATTERN);
        if(dateTimeString.endsWith("00:00:00")){
            return dateTimeString.substring(0, 10);
        }else{
            return dateTimeString;
        }
    }
    
    /**
     * 将日期时间格式成日期对象,和dateParse互用
     * @param dateTime Date
     * @return Date
     * @throws ParseException
     */
    public static Date dateTimeToDate(Date dateTime) throws ParseException{
        Calendar cal = Calendar.getInstance();
        cal.setTime(dateTime);
        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();
    }
    
    /** 
     * 时间加减小时
     * @param startDate 要处理的时间,Null则为当前时间 
     * @param hours 加减的小时 
     * @return Date 
     */  
    public static Date dateAddHours(Date startDate, int hours) {  
        if (startDate == null) {  
            startDate = new Date();  
        }  
        Calendar c = Calendar.getInstance();  
        c.setTime(startDate);  
        c.set(Calendar.HOUR, c.get(Calendar.HOUR) + hours);  
        return c.getTime();  
    }
    
    /**
     * 时间加减分钟
     * @param startDate 要处理的时间,Null则为当前时间 
     * @param minutes 加减的分钟
     * @return
     */
    public static Date dateAddMinutes(Date startDate, int minutes) {  
        if (startDate == null) {  
            startDate = new Date();  
        }  
        Calendar c = Calendar.getInstance();  
        c.setTime(startDate);  
        c.set(Calendar.MINUTE, c.get(Calendar.MINUTE) + minutes);  
        return c.getTime();  
    }
    
    /**
     * 时间加减秒数
     * @param startDate 要处理的时间,Null则为当前时间 
     * @param minutes 加减的秒数
     * @return
     */
    public static Date dateAddSeconds(Date startDate, int seconds) {  
        if (startDate == null) {  
            startDate = new Date();  
        }  
        Calendar c = Calendar.getInstance();  
        c.setTime(startDate);  
        c.set(Calendar.SECOND, c.get(Calendar.SECOND) + seconds);  
        return c.getTime();  
    }

    /** 
     * 时间加减天数 
     * @param startDate 要处理的时间,Null则为当前时间 
     * @param days 加减的天数 
     * @return Date 
     */  
    public static Date dateAddDays(Date startDate, int days) {  
        if (startDate == null) {  
            startDate = new Date();  
        }  
        Calendar c = Calendar.getInstance();  
        c.setTime(startDate);  
        c.set(Calendar.DATE, c.get(Calendar.DATE) + days);  
        return c.getTime();  
    }
    
    /** 
     * 时间加减月数
     * @param startDate 要处理的时间,Null则为当前时间 
     * @param months 加减的月数 
     * @return Date 
     */  
    public static Date dateAddMonths(Date startDate, int months) {  
        if (startDate == null) {  
            startDate = new Date();  
        }  
        Calendar c = Calendar.getInstance();  
        c.setTime(startDate);  
        c.set(Calendar.MONTH, c.get(Calendar.MONTH) + months);  
        return c.getTime();  
    }
    
    /** 
     * 时间加减年数
     * @param startDate 要处理的时间,Null则为当前时间 
     * @param years 加减的年数 
     * @return Date 
     */  
    public static Date dateAddYears(Date startDate, int years) {  
        if (startDate == null) {  
            startDate = new Date();  
        }  
        Calendar c = Calendar.getInstance();  
        c.setTime(startDate);  
        c.set(Calendar.YEAR, c.get(Calendar.YEAR) + years);  
        return c.getTime();  
    }  
    
    /** 
     * 时间比较(如果myDate>compareDate返回1,<返回-1,相等返回0) 
     * @param myDate 时间 
     * @param compareDate 要比较的时间 
     * @return int 
     */  
    public static int dateCompare(Date myDate, Date compareDate) {  
        Calendar myCal = Calendar.getInstance();  
        Calendar compareCal = Calendar.getInstance();  
        myCal.setTime(myDate);  
        compareCal.setTime(compareDate);  
        return myCal.compareTo(compareCal);  
    }
    
    /**
     * 获取两个时间中最小的一个时间
     * @param date
     * @param compareDate
     * @return
     */
    public static Date dateMin(Date date, Date compareDate) {
        if(date == null){
            return compareDate;
        }
        if(compareDate == null){
            return date;
        }
        if(1 == dateCompare(date, compareDate)){
            return compareDate;
        }else if(-1 == dateCompare(date, compareDate)){
            return date;
        }
        return date;  
    }
    
    /**
     * 获取两个时间中最大的一个时间
     * @param date
     * @param compareDate
     * @return
     */
    public static Date dateMax(Date date, Date compareDate) {
        if(date == null){
            return compareDate;
        }
        if(compareDate == null){
            return date;
        }
        if(1 == dateCompare(date, compareDate)){
            return date;
        }else if(-1 == dateCompare(date, compareDate)){
            return compareDate;
        }
        return date;  
    }
    
    /**
     * 获取两个日期(不含时分秒)相差的天数,不包含今天
     * @param startDate
     * @param endDate
     * @return
     * @throws ParseException 
     */
    public static int dateBetween(Date startDate, Date endDate) throws ParseException {
        Date dateStart = dateParse(dateFormat(startDate, DATE_PATTERN), DATE_PATTERN);
        Date dateEnd = dateParse(dateFormat(endDate, DATE_PATTERN), DATE_PATTERN);
        return (int) ((dateEnd.getTime() - dateStart.getTime())/1000/60/60/24); 
    }
    
    /**
     * 获取两个日期(不含时分秒)相差的天数,包含今天
     * @param startDate
     * @param endDate
     * @return
     * @throws ParseException 
     */
    public static int dateBetweenIncludeToday(Date startDate, Date endDate) throws ParseException {  
        return dateBetween(startDate, endDate) + 1;
    }

    /**
     * 获取两个日期相差的小时
     * @param startDate
     * @param endDate
     * @return
     * @throws ParseException 
     */
    public static int dateBetweenHour(Date startDate, Date endDate) throws ParseException {
        return (int) ((end.getTime() - start.getTime()) / (60 * 60 * 1000));
    }

    /**
     * 获取两个日期相差的分钟
     * @param startDate
     * @param endDate
     * @return
     * @throws ParseException 
     */
    public static int dateBetweenHour(Date startDate, Date endDate) throws ParseException {
        return (int) ((end.getTime() - start.getTime()) / (60 * 1000));
    }
    
    /**
     * 获取日期时间的年份,如2017-02-13,返回2017
     * @param date
     * @return
     */
    public static int getYear(Date date) {  
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        return cal.get(Calendar.YEAR);
    }
    
    /**
     * 获取日期时间的月份,如2017年2月13日,返回2
     * @param date
     * @return
     */
    public static int getMonth(Date date) {  
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        return cal.get(Calendar.MONTH) + 1;
    }
    
    /**
     * 获取日期时间的月份,如2017年2月13日,返回2
     * @param date
     * @return
     */
    public static int getMonth(Date date) {  
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        return cal.get(Calendar.MONTH) + 1;
    }

    /**
     * 获取日期时间的星期(即返回星期几),如2017-02-13,返回星期三
     * @param date
     * @return
     */
    public static int getDate(Date date) {  
        String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		int dayIndex = calendar.get(calendar.DAY_OF_WEEK) - calendar.SUNDAY;
		if (dayIndex < 0) {
			dayIndex = 0;
		}
		return weekDays[dayIndex];
    }
    
    /**
     * 获取日期时间当月的总天数,如2017-02-13,返回28
     * @param date
     * @return
     */
    public static int getDaysOfMonth(Date date) {  
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        return cal.getActualMaximum(Calendar.DATE);
    }
    
    /**
     * 获取日期时间当年的总天数,如2017-02-13,返回2017年的总天数
     * @param date
     * @return
     */
    public static int getDaysOfYear(Date date) {  
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        return cal.getActualMaximum(Calendar.DAY_OF_YEAR);
    }
    
    /**
     * 根据时间获取当月最大的日期
     * <li>2017-02-13,返回2017-02-28</li>
     * <li>2016-02-13,返回2016-02-29</li>
     * <li>2016-01-11,返回2016-01-31</li>
     * @param date Date
     * @return
     * @throws Exception 
     */
    public static Date maxDateOfMonth(Date date) throws Exception {
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        int value = cal.getActualMaximum(Calendar.DATE);
        return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
    }
    
    /**
     * 根据时间获取当月最小的日期,也就是返回当月的1号日期对象
     * @param date Date
     * @return
     * @throws Exception 
     */
    public static Date minDateOfMonth(Date date) throws Exception {
        Calendar cal = Calendar.getInstance();  
        cal.setTime(date);
        int value = cal.getActualMinimum(Calendar.DATE);
        return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
    }
    
    
    
    
}

 

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