text: // call with (logDateTimeAsUnixTimestamp(str), duration(str))
  
  export default function timerange(startTimestamp, durationInSeconds) {
    const startMilliseconds = startTimestamp * 1000;
  
    const endMilliseconds = startMilliseconds + durationInSeconds * 1000;
  
    return {
      startMilliseconds,
      endMilliseconds
    };
  }
  