Javascript Date的常用处理函数实例

//计算两个日期相差几天几小时 
Date.diffDayHourString = function(date1,date2){ 
    var date3; 
    if(typeof date1 == "object"){ 
        date3=date2.getTime()-date1.getTime();  //时间差的毫秒数 
    } 
    else{ 
        date3=date2-date1;  //时间差的毫秒数 
    } 
    var days=Math.floor(date3/(24*3600*1000)); 
    var leave1=date3%(24*3600*1000);    //计算天数后剩余的毫秒数 
    var hours=Math.floor(leave1/(3600*1000)); 
    return days+"D "+hours+"H"; 
} 
 
//计算两个日期相差几个小时 
Date.diffHourInt = function(date1,date2){ 
    var date3; 
    if(typeof date1 == "object"){ 
        date3=date2.getTime()-date1.getTime();  //时间差的毫秒数 
    } 
    else{ 
        date3=date2-date1;  //时间差的毫秒数 
    } 
    var days=Math.floor(date3/(24*3600*1000)); 
    var leave1=date3%(24*3600*1000);    //计算天数后剩余的毫秒数 
    var hours=Math.floor(leave1/(3600*1000)); 
    return days*24+hours; 
} 
 
Date.getTime = function(dateStr/*yyyy-MM-dd HH:mm:ss*/){ 
    var d = new Date(dateStr); 
    return d.getTime(); 
} 
 
Date.MONTH_DAYS = [31,0,31,30,31,30,31,31,30,31,30,31]; 
Date.ENG_MONTH_MAP = {'Jan':1, 'Feb':2, 'Mar':3, 'Apr':4, 'May':5, 'Jun':6, 'Jul':7, 'Aug':8, 'Sep':9, 'Oct':10, 'Nov':11, 'Dec':12}; 
Date.MONTH_ENG_MAP = ['Jan','Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; 
 
//计算某年某月天数 
Date.getMonthDays = function(year,month){ 
    year-=0;month-=0; 
    if(month==1){ 
        if (0==year%4&&((year%100!=0)||(year%400==0)))return 29 
        else return 28; 
    } 
    else return Date.MONTH_DAYS[month]; 
} 
 
/**
 * 给定年和周，算出这周的开始日期和结束日期
 * 先检查一年的开始时间是否是周一
 * 然后计算出一年开始到某周的天数
 * 开始日期 = 某年第一天毫秒数 + 天数的毫秒数
 * 注意某一年的开始第一周和某年结束一周需要特殊处理
 * */ 
Date.getStartEndDateOfWeek = function(year,numOfWeek,outStr){ 
    year-=0;numOfWeek-=1; 
    var b = new Date(year,0,1),bDayOfWeek = b.getDay()||7, 
        startDate = new Date(),endDate = new Date(), 
        extraDays = (7-bDayOfWeek+1),fullDays; 
    if(extraDays!=7) {  www.jiaochengji.com
        numOfWeek -= 1;  
        fullDays = numOfWeek*7+extraDays; 
    } 
    else{ 
        fullDays = numOfWeek*7; 
    } 
 
    startDate.setTime(new Date(year,0,1).getTime() + (fullDays <= 0 ? 0 : fullDays*24*60*60*1000)); 
    endDate.setTime(startDate.getTime() + (numOfWeek < 0 && extraDays != 7 ? extraDays-1 : 6 )*24*60*60*1000); 
    if(endDate.getFullYear() > year){ 
        endDate = new Date(year,11,31); 
    } 
    //console.log(startDate.toString(),endDate.toString()); 
    if(outStr){ 
        return (startDate.getMonth()+1)+"."+startDate.getDate()+"~"+(endDate.getMonth()+1)+"."+endDate.getDate(); 
    } 
    else{ 
        return [startDate,endDate]; 
    }     
} 
 
//日期格式化 
Date.prototype.format = function (formatStr) {    
    var date = this;    
    /*   
    函数：填充0字符   
    参数：value-需要填充的字符串, length-总长度   
    返回：填充后的字符串   
    */   
    var zeroize = function (value, length) {    
        if (!length) {    
            length = 2;    
        }    
        value = new String(value);    
        for (var i = 0, zeros = ''; i < (length - value.length); i++) {    
            zeros += '0';    
        }    
        return zeros + value;    
    };    
    return formatStr.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|M{1,4}|yy(?:yy)?|([hHmstT])\1?|[lLZ])\b/g, function($0) {    
        switch ($0) {     www.jiaochengji.com
            case 'd': return date.getDate();    
            case 'dd': return zeroize(date.getDate());    
            case 'ddd': return ['Sun', 'Mon', 'Tue', 'Wed', 'Thr', 'Fri', 'Sat'][date.getDay()];    
            case 'dddd': return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][date.getDay()];    
            case 'M': return date.getMonth() + 1;    
            case 'MM': return zeroize(date.getMonth() + 1);    
            case 'MMM': return ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][date.getMonth()];    
            case 'MMMM': return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][date.getMonth()];    
            case 'yy': return new String(date.getFullYear()).substr(2);    
            case 'yyyy': return date.getFullYear();    
            case 'h': return date.getHours() % 12 || 12;    
            case 'hh': return zeroize(date.getHours() % 12 || 12);    
            case 'H': return date.getHours();    
            case 'HH': return zeroize(date.getHours());    
            case 'm': return date.getMinutes();    
            case 'mm': return zeroize(date.getMinutes());    
            case 's': return date.getSeconds();    
            case 'ss': return zeroize(date.getSeconds());    
            case 'l': return date.getMilliseconds();    
            case 'll': return zeroize(date.getMilliseconds());    
            case 'tt': return date.getHours() < 12 ? 'am' : 'pm';    
            case 'TT': return date.getHours() < 12 ? 'AM' : 'PM';    
        }    
    });    
} 
 
//计算日期处在月中的第几周 
Date.prototype.getMonthWeek = function () {     
    var date = this, w = date.getDay(), d = date.getDate();     
    return Math.ceil((d + 6 - w) / 7);     
};     
 
//计算日期处在月中的第几周 
Date.prototype.getYearWeek = function () {        
    var date1 = this, date2 = new Date(date1.getFullYear(), 0, 1),     
        d = Math.round((date1.valueOf() - date2.valueOf()) / 86400000);     
    return Math.ceil((d + (((date2.getDay()||7) + 1) - 1)) / 7);     
};