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js & Date & format

let begintime = new Date().format('yyyy-MM-dd');
// "2018-12-27"

let endtime = new Date().format('yyyy-MM-dd');
// "2018-12-27"

MDN

format()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toTimeString

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat

old

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleFormat

prototype & extension

"use strict";

/**
 * 
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2018.12.27
 * @modified 2018.12.27
 * 
 * @description 对Date的扩展，将 Date 转化为指定格式的String  
 * @augments 
 * @example 
 * 
 */

/*

月(M)、日(d)、小时(h)、分(m)、秒(s)、季度(q) 可以用 1-2 个占位符，   
年(y)可以用 1-4 个占位符，毫秒(S)只能用 1 个占位符(是 1-3 位的数字)
(new Date()).Format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423   
(new Date()).Format("yyyy-M-d h:m:s.S")      ==> 2006-7-2 8:9:4.18   

*/


Date.prototype.Format = function (fmt) {
    // q 季度
    // M 月
    // D 日
    // h 时
    // m 分
    // s 秒
    // S 毫秒
    const o = {
        "M+": this.getMonth() + 1,
        "d+": this.getDate(),
        "h+": this.getHours(),
        "m+": this.getMinutes(),
        "s+": this.getSeconds(),
        "q+": Math.floor((this.getMonth() + 3) / 3),
        "S": this.getMilliseconds(),
    };
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (let k in o)
        if (new RegExp("(" + k + ")").test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        }
    return fmt;
}