Java 时间工具类收集（持续更新）

引包 

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

    /**
     *  计算时间间隔
     * @param start
     * @param end
     * @param format "yyyy-MM-dd HH:mm:ss"
     * @param type 间隔类型（d、H、m、s）
     * @return String
     */
    public static Long timeInterval(String start,String end,String format,String type)throws ParseException{
        SimpleDateFormat df = new SimpleDateFormat(format);
        long startL =df.parse(start).getTime();
        long endL =df.parse(end).getTime();

        int num = 1;
        switch (type){
            case "d":
                num = 1000*60*60*24;
                break;
            case "H":
                num = 1000*60*60;
                break;
            case "m":
                num = 1000*60;
                break;
            case "s":
                num = 1000;
                break;
        }
        return  (endL - startL) / num;
    }

    /**
     * 获取上n个小时整点小时时间
     * @param date
     * @return String
     */
    public static String getLastHourTime(Date date, int n,String type){
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        SimpleDateFormat sdf = new SimpleDateFormat(type);
        ca.set(Calendar.HOUR_OF_DAY, ca.get(Calendar.HOUR_OF_DAY)-n);
        date = ca.getTime();
        return sdf.format(date);
    }

    /**
     * 获取当前时间的整点小时时间
     * @param date
     * @return String
     */
    public static String getCurrHourTime(Date date,String type){
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        date = ca.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat(type);
        return sdf.format(date);
    }

    /**
     * 获取当前时间的整点小时时间
     * @param sdate
     * @return String
     */
    public static String getCurrHourTimeString(String sdate,String type){
        try {
            SimpleDateFormat format = new SimpleDateFormat(type);
            Calendar ca = Calendar.getInstance();
            ca.set(Calendar.MINUTE, 0);
            ca.set(Calendar.SECOND, 0);
            Date strtodate = format.parse(sdate);
            strtodate = ca.getTime();
            return format.format(strtodate);
        }catch (Exception e){
            return "";
        }
    }

    /**
     * 获取上n个小时整点小时时间
     * @param sdate
     * @return String
     */
    public static String getLastHourTimeString(String sdate, int n,String type){
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(type);
            Date date=sdf.parse(sdate);
            Calendar ca = Calendar.getInstance();
            ca.set(Calendar.MINUTE, 0);
            ca.set(Calendar.SECOND, 0);
            ca.set(Calendar.HOUR_OF_DAY, ca.get(Calendar.HOUR_OF_DAY)-n);
            date = ca.getTime();
            return sdf.format(date);
        }catch (Exception e){
            return "";
        }
    }

    /**
     * 根据指定格式，获取当前时间
     * @param format "yyyy-MM-dd HH:mm:ss"
     * @return String
     */
    public static String getNowDateByType(String format){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date());
    }

    /**
     * 根据指定格式，格式化指定时间
     * @param format "yyyy-MM-dd HH:mm:ss"
     * @param date
     * @return String
     */
    public static String formatDate(String format,Date date){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(date);
    }

 

/**
 * 计算2个日期相差多少年
 * @param fromDate
 * @param toDate
 * @return String
 */
public static String yearCompare(Date fromDate,Date toDate){
    DayCompare result = dayComparePrecise(fromDate, toDate);
    double month = result.getMonth();
    double year = result.getYear();
    //返回2位小数，并且四舍五入
    DecimalFormat df = new DecimalFormat("######0.0");
    return df.format(year + month / 12);
}

    /**
     * 在指定时间基础上增加时间
     * @param oldTime
     * @param format "yyyy-MM-dd HH:mm:ss"
     * @param add（毫秒数）
     * @return String
     * @throws ParseException
     */
    public static String  TimeAdd(String oldTime,String format ,int add) throws ParseException{
        SimpleDateFormat sdf = new SimpleDateFormat(type);
        ParsePosition pos = new ParsePosition(0);
        Date createtime = sdf.parse(oldTime,pos);
        createtime.setTime(createtime.getTime()+add);
        return sdf.format(createtime);
    }

 

 

 

 

 

未完，待续………………