js 日期格式化及日期增減

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//Demo:new Date().format("yyyy-MM-dd hh:mm:ss.SSS")Date.prototype.format = function (format) {    var o = {        "M+": this.getMonth() + 1, //month        "d+": this.getDate(), //day        "h+": this.getHours(), //hour        "m+": this.getMinutes(), //minute        "s+": this.getSeconds(), //second        "q+": Math.floor((this.getMonth() + 3) / 3), //quarter        "S": this.getMilliseconds() //millisecond    }    if (/(y+)/.test(format)) format = format.replace(RegExp.$1,    (this.getFullYear() + "").substr(4 - RegExp.$1.length));    for (var k in o) if (new RegExp("(" + k + ")").test(format))        format = format.replace(RegExp.$1,        RegExp.$1.length == 1 ? o[k] :        ("00" + o[k]).substr(("" + o[k]).length));    return format;}Date.prototype.addYears = function (num) {    num = parseInt(num);    var sYear = this.getFullYear();    var sMonth = this.getMonth();    var sDay = this.getDate();    var eYear = sYear + num;    var eMonth = sMonth;    var eDay = sDay;    var eDate = new Date(eYear, eMonth, eDay);    while (eDate.getMonth() != eMonth) {        eDay--;        eDate = new Date(eYear, eMonth, eDay);    }    var times = eDate.getTime() - new Date(sYear, sMonth, sDay).getTime();    return new Date(new Date().getTime() + times);}//Demo:new Date().addMonths(-1)Date.prototype.addMonths = function (num) {    num = parseInt(num);    var sYear = this.getFullYear();    var sMonth = this.getMonth() + 1;    var sDay = this.getDate();    var eYear = sYear;    var eMonth = sMonth + num;    var eDay = sDay;    while (eMonth > 12) {        eYear++;        eMonth -= 12;    }    while (eMonth <= 0) {        eYear--;        eMonth += 12;    }    var eDate = new Date(eYear, eMonth - 1, eDay);    while (eDate.getMonth() != eMonth - 1) {        eDay--;        eDate = new Date(eYear, eMonth - 1, eDay);    }    var times = eDate.getTime() - new Date(sYear, sMonth - 1, sDay).getTime();    return new Date(new Date().getTime() + times);}Date.prototype.addDates = function (num) {    return this.addHours(num * 24);}Date.prototype.addHours = function (num) {    return this.addMinutes(num * 60);}Date.prototype.addMinutes = function (num) {    return this.addSeconds(num * 60);}Date.prototype.addSeconds = function (num) {    num = parseInt(num);    return new Date(new Date().getTime() + num * 1000);}

 

js 日期格式化及日期增減