java DateUtil date tool source code

package com.util;

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

public class DateUtil {
    public static String minuteFormat="yyyy-MM-dd HH:mm";
    public static String secondFormat="yyyy-MM-dd HH:mm:ss";
    public static String dayFormat="yyyy-MM-dd";
    public static String zeroTime="0000-00-00 00:00:00";
    //得到当前时间（精确到天）
    public static String getCurrentTimeByDay(){
        return getCurrentTime(dayFormat);
    }
    //得到当前时间（精确到分钟）
    public static String getCurrentTimeByMinute(){
        return DateUtil.getCurrentTime(minuteFormat);
    }
    //得到当前时间（精确到秒）
    public static String getCurrentTimeBySecond(){
        return DateUtil.getCurrentTime(secondFormat);
    }
    //得到当前时间（自定义格式）
    public static String getCurrentTime(String format){
        Date date=new Date();
        SimpleDateFormat sdf=new SimpleDateFormat(format);
        String currentTime=sdf.format(date);
        return currentTime;
    }
    //计算当前时间差（精确到秒）
    public static long calcTimeDifferenceBySecond(String oldTime){
        return DateUtil.calcTimeDifferenceBySecond(oldTime,DateUtil.getCurrentTimeBySecond());
    }
    //计算时间差（精确到秒）
    public static long calcTimeDifferenceBySecond(String oldTime,String newTime){
        SimpleDateFormat simpleDateFormat=new SimpleDateFormat(secondFormat);
        long seconds=0;
        try {
            Date newDate = simpleDateFormat.parse(newTime);
            Date oldDate=simpleDateFormat.parse(oldTime);

			//得到时间差
            long diff=newDate.getTime()-oldDate.getTime();//ms
            seconds=diff/1000;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return seconds;
    }
    //计算当前时间差（精确到分钟）
    public static long calcTimeDifferenceByMinute(String oldTime){
        return DateUtil.calcTimeDifferenceBySecond(oldTime)/60;
    }
    //计算时间差（精确到分钟）
    public static long calcTimeDifferenceByMinute(String oldTime,String newTime){
        return DateUtil.calcTimeDifferenceBySecond(oldTime, newTime)/60;
    }
    //毫秒转HH小时mm分钟ss秒
    public static String millisToHHmmss(long millis){
        long secends=millis/1000;
		String timeStr = null;
		int hour = 0;
		int minute = 0;
		int second = 0;
		if (secends<= 0) {
			return "0秒";
		} else {
			minute = secends/ 60;
			if (minute == 0) {
				String secendStr=seconds<10?"0"+seconds:seconds+"";
				timeStr = secendStr + "秒";
			} else if (minute < 60) {
				second = seconds% 60;
				timeStr = Integer.toString(minute) + "分" + Integer.toString(second) + "秒";
			} else {
				hour = minute / 60;
				minute = minute % 60;
				second = seconds- hour * 3600 - minute * 60;
				timeStr = Integer.toString(hour) + "小时" + Integer.toString(minute) + "分" + Integer.toString(second)+ "秒";
			}
		}
		return timeStr;
    }
}