Java 项目常用的日期方法class

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Java 项目常用的日期方法class

package com.school.util;

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

/**
 * 提供一些跟日期相关的通用方法。
 * @author nimade
 */
public abstract class SchoolDateUtils {

    /**
     * “今日”的开始时间。
     */
    public static Date getTodayStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * “今日”的结束时间。
     */
    public static Date getTodayEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * “昨日”的开始时间。
     */
    public static Date getYesterdayStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        // 昨日
        cal.add(Calendar.DAY_OF_MONTH, -1);

        return cal.getTime();
    }

    /**
     * “昨日”的结束时间。
     */
    public static Date getYesterdayEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        // 昨日
        cal.add(Calendar.DAY_OF_MONTH, -1);

        return cal.getTime();
    }
    


    /**
     * 最近几天前的时间。
     */
    public static Date getRecentDateStart(Integer day) {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        // 以前的时间
        cal.add(Calendar.DAY_OF_MONTH, -day);//由当前时间，推算出几天前的时间

        return cal.getTime();
    }
    
    /**
     * 未來几天前的时间。
     */
    public static Date getFutureDateStart(Integer day) {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        // 以前的时间
        cal.add(Calendar.DAY_OF_MONTH, +day);//由当前时间，推算出將來的时间

        return cal.getTime();
    }
    
    
    /**
     * “前天”的开始时间。
     */
    public static Date getQianTianStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        // 前天
        cal.add(Calendar.DAY_OF_MONTH, -2);

        return cal.getTime();
    }

    /**
     * “前天”的结束时间。
     */
    public static Date getQianTianEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH));

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        // 前天
        cal.add(Calendar.DAY_OF_MONTH, -2);

        return cal.getTime();
    }

    /**
     * “本周”的开始时间。
     */
    public static Date getThisWeekStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY); // 周日

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * “本周”的结束时间。
     */
    public static Date getThisWeekEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY); // 周六

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * “上周”的开始时间。
     */
    public static Date getLastWeekStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY); // 周日

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        // 上周
        cal.add(Calendar.DATE, -7);

        return cal.getTime();
    }

    /**
     * “上周”的结束时间。
     */
    public static Date getLastWeekEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));
        cal.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY); // 周六

        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        // 上周
        cal.add(Calendar.DATE, -7);

        return cal.getTime();
    }

    /**
     * “本月”的开始时间。
     */
    public static Date getThisMonthStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));

        cal.set(Calendar.DAY_OF_MONTH, now.getActualMinimum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * “本月”的结束时间。
     */
    public static Date getThisMonthEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));

        cal.set(Calendar.DAY_OF_MONTH, now.getActualMaximum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * “上月”的开始时间。
     */
    public static Date getLastMonthStart() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));

        cal.set(Calendar.DAY_OF_MONTH, now.getActualMinimum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        // 上月
        cal.add(Calendar.MONTH, -1);

        return cal.getTime();
    }

    /**
     * “上月”的结束时间。
     */
    public static Date getLastMonthEnd() {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, now.get(Calendar.YEAR));
        cal.set(Calendar.MONTH, now.get(Calendar.MONTH));

        cal.set(Calendar.DAY_OF_MONTH, now.getActualMaximum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        // 上月
        cal.add(Calendar.MONTH, -1);

        return cal.getTime();
    }
    
    
    /****************根据传进来的数字，获取某一年，某一个月的开始日期，与结束日期*********************/
    

    /**
     * “根据传进来的数字”的开始时间。
     */
    public static Date getNumMonthStart(Integer year,Integer month) {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        java.util.Date date;
        try {
            date = new SimpleDateFormat("yyyy-MM-dd").parse(year.toString()+"-"+month.toString()+"-"+"01");
            now.setTime(date); 
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
        
         
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month-1);

        cal.set(Calendar.DAY_OF_MONTH, now.getActualMinimum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMinimum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMinimum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMinimum(Calendar.MILLISECOND));

        return cal.getTime();
    }

    /**
     * "根据传进来的数字"的结束时间。
     */
    public static Date getNumMonthEnd(Integer year,Integer month) {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        
        java.util.Date date;
        try {
            date = new SimpleDateFormat("yyyy-MM-dd").parse(year.toString()+"-"+month.toString()+"-"+"01");
            now.setTime(date); 
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
        
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month-1);

        cal.set(Calendar.DAY_OF_MONTH, now.getActualMaximum(Calendar.DAY_OF_MONTH));
        cal.set(Calendar.HOUR_OF_DAY, now.getActualMaximum(Calendar.HOUR_OF_DAY));
        cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
        cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
        cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));

        return cal.getTime();
    }
    
    /***
     * 获取指定月份的所用日期
     */
    /**
     * "根据传进来的数字"的结束时间。
     */
    public static List<String> getNumMonthAll(Integer year,Integer month) {
        Calendar now = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
        
        List<String> monthOfDayList=new ArrayList<String>();
        
        java.util.Date date;
        try {
            date = new SimpleDateFormat("yyyy-MM-dd").parse(year.toString()+"-"+month.toString()+"-"+"01");
            now.setTime(date); 
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
        
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month-1);
        
        cal.set(Calendar.DAY_OF_MONTH, now.getActualMaximum(Calendar.DAY_OF_MONTH));
       
        int day=now.getActualMaximum(Calendar.DAY_OF_MONTH);//获取指定月份的最大天数
        
        for(int i=1;i<=day;i++){
            cal.set(Calendar.DAY_OF_MONTH, i);
            cal.set(Calendar.HOUR_OF_DAY, now.getActualMinimum(Calendar.HOUR_OF_DAY));
            cal.set(Calendar.MINUTE, now.getActualMaximum(Calendar.MINUTE));
            cal.set(Calendar.SECOND, now.getActualMaximum(Calendar.SECOND));
            cal.set(Calendar.MILLISECOND, now.getActualMaximum(Calendar.MILLISECOND));
            
            Date dateC = cal.getTime();
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
            monthOfDayList.add(sdf.format(dateC));
        }
        

        return monthOfDayList;
    }
}

Java 项目常用的日期方法class

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原文地址：http://blog.csdn.net/kenhins/article/details/46473299