JS calculates the display date according to the time

 getTime() {
    
      getTime(
        '',
        (res) => {
    
          console.log(' system time ', res.data.data.time_now)
          this.nowTime = res.data.data.time_now
          this.orderData.forEach((val, index) => {
    
            let newTime = (val.expire_time - this.nowTime) * 1000
            console.log('newTime', newTime)
            let days = Math.floor(newTime / (24 * 3600 * 1000)) //  Calculate the number of days 
            let leavel = newTime % (24 * 3600 * 1000) //  Time remaining after calculating days 
            let hours = Math.floor(leavel / (3600 * 1000)) //  Count the remaining hours 
            let leavel2 = leavel % (3600 * 1000) //  Calculate the number of milliseconds remaining after the remaining hours 
            let minutes = Math.floor(leavel2 / (60 * 1000)) //  Count the minutes left 
            if (days === 0) {
    
              var tt = `${
      hours} Hours ${
      minutes} minute `
            } else if (hours === 0) {
    
              var tt = `${
      minutes} minute `
            } else {
    
              var tt = `${
      days} God ${
      hours} Hours ${
      minutes} minute `
            }

            this.$set(this.orderData[index], 'tt', tt)
          })
        },
        (err) => {
    
          console.log('err', err)
        }
      )
      console.log('orderData', this.orderData)
    },