code: public static long from(long otherTime, int timeScale)
      {
          TimeScaleData data = fromRangeCheck(otherTime, timeScale);
                  
          return (otherTime + data.epochOffset) * data.units;
      }
docs: Convert a <code>long</code> datetime from the given time scale to the universal time scale.
  
  @param otherTime The <code>long</code> datetime
  @param timeScale The time scale to convert from
  
  @return The datetime converted to the universal time scale