docs: function (finalDate, option) {
    option = option || {}
    this.PRECISION = option.precision || 100 // 0.1 seconds, used to update the DOM
    this.interval = null
    this.offset = {}
    // Register this instance
    this.instanceNumber = instances.length
    instances.push(this)
    // Set the final date and start
    this.setFinalDate(finalDate)
  }