check if timestamp is old than 24 hours - Javascript

Question

I'm using the Date.now() function to get the timestamp when an api call is made. I'm storing it in the database powered by nedb-promises. How I can use it later in the code to check if a new api call is necessary to update the stored data? I want to check at least once a day.

db.definitions.find({}).then( (results) => {
  if( results.length > 0 ){
    console.log(results);
    if( Math.round(new Date().getTime() / 1000) - results.lastUpdate >= 86400 ){
      updateDefinitions().then( (filters) => {
        db.definitions.update({}, { $set: {filters} }, { returnUpdatedDocs: true }).then( (result) => {
          console.log(result);
          advServers.push(results.filters.easylist);
          trackingServers.push(results.filters.easyprivacy);
        });
      });
    }else{
      console.log("definitions already up to date");
      advServers.push(results.easylist);
      trackingServers.push(results.easyprivacy);
    }
  }else{
    updateDefinitions().then( (filters) => {
      console.log(filters);
      db.definitions.insert({ filters }).then( (result) => {
        console.log(result);
        advServers.push(results.filters.easylist);
        trackingServers.push(results.filters.easyprivacy);
      });
    });
  }
});