code: function Time(options) {
    if (!(this instanceof Time)) {
      return new Time(options);
    }
  
    this.options = options || {};
    var smallest = this.options.smallest;
    var digits = this.options.digits;
  
    if (isNumber(smallest)) {
      digits = smallest;
      smallest = null;
    }
  
    this.smallest = smallest;
    this.digits = digits;
    this.times = {};
  }
docs: Create an instance of `Time`, optionally specifying the
  time-scale to use and/or the number of decimal places to display.
  
  ```js
  var time = new Time('s', 3);
  ```
  @param {String|Number} `smallest` The smallest time scale to show, or the number of decimal places to display
  @param {Number} `digits` The number of decimal places to display