JS時間操作大全

1、獲取每個月的開始和結束。

2、獲取每個季度的開始和結束。

3、獲取當前季度。

4、把日期轉換為字符串(支持各種格式）

...

5、未完待續，不斷添加

 String.prototype.padingStar=function(totalLength,padingStr="") {
            if (totalLength <= this.length) {
                return this;
            }
            
 
var padLength = totalLength - this.length;
            if (padLength <= padingStr.length) {
                return padingStr.substring(0, padLength) + this;
            } else {
                var len = padLength / padingStr.length, n = 1,str=‘‘;
                while (n<len) {
                    str 
 
+= padingStr;
                    n++;
                }
                return str + padingStr.substring(0, padLength - (n-1) * padingStr.length) +this;
            }
        }

        String.prototype.padingEnd = function (totalLength, padingStr="") {
            //在開始的補全後面
            if (totalLength <= this
 
.length) {
                return this;
            }
            var padLength = totalLength - this.length;
            if (padLength <= padingStr.length) {
                return padingStr.substring(0, padLength) + this;
            } else {
                var len = padLength / padingStr.length, n = 0,str=‘‘;
                while (n<len) {
                    str += padingStr;
                    n++;
                }
                return this + padingStr.substring(0, padLength - (n - 1) * padingStr.length)+str;
            }
        }


        //獲取當前月的開始
        Date.prototype.starOfMonth=function() {
            return new Date(this.getFullYear(), this.getMonth(), 1, 00, 00, 00);
        }

        //獲取當前月的結束
        Date.prototype.endOfMonth=function() {
            return new Date(this.getFullYear(), this.getMonth() + 1, 0, 23, 59, 59);
        }

        //獲取當前季度的開始時間
        Date.prototype.starofQuarter=function() {
            return new Date(this.getFullYear(), (this.getQuarter() - 1) * 3, 01, 00, 00, 00);
        }

        //獲取當前季度的結束時間
        Date.prototype.endofQuarter=function() {
            return new Date(this.getFullYear(), this.getQuarter() * 3-1 , 31, 23, 59, 59);
        }

        //獲取當前時間對應的季度
        Date.prototype.getQuarter=function() {
            return Math.ceil((this.getMonth() + 1) / 3);
        }

        //獲取當前時間對應的年的開始
        Date.prototype.starOfYear=function() {
            return new Date(this.getFullYear(), 01, 01, 00, 00, 00);
        } 

        //獲取當前時間對應年的結束
        Date.prototype.endOfYear=function() {
            return new Date(this.getFullYear(), 12, 31, 23, 59, 59);
        }

        //把時間格式化為字符串
        Date.prototype.toDateString = function(format) {
            if (typeof (format) == "undefined") {
                return this.toString();
            }
            //可能我的第一個想法，就是
            if (/y{4}/.test(format)) {
                format = format.replace(/yyyy/g, this.getFullYear());
            }
            if (/y{2}/.test(format)) {
                format = format.replace(/y{2}/g,this.getFullYear().toString().substr(2));
            }
            if (/M{2}/.test(format)) {
                format = format.replace(/MM/,this.getMonth().toString().padingStar(2,0));
            }
            if (/dd/.test(format)) {
                format = format.replace(/dd/,this.getDate().toString().padingStar(2,‘0‘));
            }
            if (/HH/.test(format)) {
                format = format.replace(/HH/g, this.getHours().toString().padingStar(2, ‘0‘));
            }
            if (/hh/.test(format)) {
                format = format.replace(/hh/g, (hour < 12 ? hour : hour - 12).toString().padingStar(2, ‘0‘));
            }
            if (/mm/.test(format)) {
                format = format.replace(/mm/g, this.getMinutes().toString().padStart(2, ‘0‘));
            }
            if (/ss/.test(format)) {
                format = format.replace(/ss/g, this.getSeconds().toString().padStart(2, ‘0‘));
            }
            return format;
        }

        
        //獲取兩個時間相隔的天數
        Date.prototype.betweenDays=function(date) {
            var daySpan = (Date.parse(this) - Date.parse(date)) / 86400000;
            return daySpan;
        }

github地址：https://github.com/gdoujkzz/JsDate.git

JS對時間的操作