最全的时间转换 ts

各种类型 时间形式  转为字符串

time:时间值 

cFormat:    {y}-{m}-{d} {h}:{i}:{s}

                  {y}-{m}-{d} {h}:{i}:{s} {a}

                  {y}/{m}/{d} 

1.  

   // Parse the time to string
    const parseTime = (
     time?: object | string | number | null,
     cFormat?: string
   ): string | null => {
     if (time === undefined || !time) {
       return null;
     }
     const format = cFormat || "{y}-{m}-{d} {h}:{i}:{s}";
     let date: Date;
     if (typeof time === "object") {
       date = time as Date;
     } else {
       if (typeof time === "string") {
         if (/^[0-9]+$/.test(time)) {
           // support "1548221490638"
           time = parseInt(time);
         } else {
           // support safari
           // https://stackoverflow.com/questions/4310953/invalid-date-in-safari
           time = time.replace(new RegExp(/-/gm), "/");
         }
       }
       if (typeof time === "number" && time.toString().length === 10) {
         time = time * 1000;
       }
       date = new Date(time);
     }
     const formatObj: { [key: string]: number } = {
       y: date.getFullYear(),
       m: date.getMonth() + 1,
       d: date.getDate(),
       h: date.getHours(),
       i: date.getMinutes(),
       s: date.getSeconds(),
       a: date.getDay()
     };
     const timeStr = format.replace(/{([ymdhisa])+}/g, (result, key) => {
       const value = formatObj[key];
    
       // Note: getDay() returns 0 on Sunday
       if (key === "a") {
         console.log(value);
         return `星期${["日", "一", "二", "三", "四", "五", "六"][value]}` ;
       }
       return value.toString().padStart(2, "0");
     });
     return timeStr;
   };

   调用方法， 

   parseTime(new Date());
   // console :2020-11-30 10:36:24
    
   parseTime('2020-12-2');
   // console :2020-12-02 00:00:00
       
   parseTime(1604938866479);
   // console :2020-11-10 00:21:06
    
   parseTime("1604938866479");
   // console :2020-11-10 00:21:06
    
   parseTime("1604938866479","{y}-{m}-{d} {h}:{i}:{s}{a}");
   // console : 2020-11-10 00:21:06 星期二
    
   parseTime("1604938866479","{m}/{d}/{y}");
   // console : 12/02/2020
    
   parseTime(1);
   // console :1970-01-01 08:00:00
    
   parseTime(null);
   // console :null
    
   parseTime("");
   // console :null
    
   parseTime(undefined);
   // console :null