微信小程序--日期格式化和实现倒计时

1.中国标准时间格式化：

    formatDateTime: 
   function(theDate) { 
  
   var _hour = theDate.getHours(); 
  
   var _minute = theDate.getMinutes(); 
  
   var _second = theDate.getSeconds(); 
  
   var _year = theDate.getFullYear() 
  
   var _month = theDate.getMonth(); 
  
   var _date = theDate.getDate(); 
  
   if (_hour < 
   10) { _hour = 
   "0" + _hour } 
  
   if (_minute < 
    10) { _minute = 
   "0" + _minute } 
  
   if (_second < 
    10) { _second = 
   "0" + _second } 
  
    _month = _month + 
   1 
  
   if (_month < 
    10) { _month = 
   "0" + _month; } 
  
   if (_date < 
   10) { _date = 
   "0" + _date } 
  
   var time= _year + 
    "-" + _month + 
   "-" + _date + 
    " " + _hour + 
   ":" + _minute + 
    ":" + _second; 
  
     // var time = new Date(); 
    
     // var formatTime = formatDateTime(time); 
    
     // 返回结果： 
    
     // Tue Jun 06 2017 15:31:09 GMT+ 0800(中国标准时间) 
    
     // 2017 - 06 - 06 15:31:09 
    
    // 
   clock为在data中定义的空变量，存放转化好的日期 
  
   this.setData({ 
  
    clock: time 
  
    }) 
  
    },

 
   2、把格式化时间转换为毫秒数 
  
   var formatTimeS = 
    new Date( 
   '2017-06-06 15:31:09').getTime(); 
  
    返回结果： 
   1496734269900 
  
   3、把毫秒数转换为标准时间 
  
   var formatTimeS = 
    new Date( 
   1496734269900); 
  
    返回结果： 
  
    Tue Jun 
   06 
   2017 
   15: 
   31: 
   09 GMT+ 
   0800(中国标准时间) 
  
    二：实现倒计时 
  
     //倒计时:其中time_canshu为传入的毫秒数 
    
      date_format: 
     function (time_canshu) { 
    
     // let formatTime1 = new Date().getTime(); 
    
     //  let formatTime2 = new Date('2018-04-24 15:31:09').getTime(); 
    
     //  let formatTimeS = new Date(formatTime2 - formatTime1); 
    
     var none = 
     '00:00:00'; 
    
     if (formatTimeS<= 
     0){ 
    
     this.setData({ 
    
      clock: none 
    
      }) 
    
      } 
     else{ 
    
     // 秒数  
    
     let second = Math.floor(time_canshu / 
     1000); 
    
     // 小时位  
    
     let hr = Math.floor(second / 
     3600); 
    
     // 分钟位  
    
     let min = Math.floor((second - hr * 
     3600) / 
     60); 
    
     // 秒位  
    
     let sec = second % 
     60; 
     // equal to => var sec = second % 60;  
    
     if (hr <= 
     9) hr = 
     '0' + hr; 
    
     if (min <= 
     9) min = 
     '0' + min; 
    
     if (sec <= 
     9) sec = 
     '0' + sec; 
    
     let time = hr + 
     ":" + min + 
      ":" + sec + 
     " "; 
    
     this.setData({ 
    
      clock: time 
    
      }) 
    
      } 
    
      },

微信小程序--日期格式化和实现倒计时

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