mongo-current-date.js

function getCurrentDateP(mongoConnection) {
  const query = { _id: 1 };
  const update = { $currentDate: { updated_at: true } };
  const queryOptions = { upsert: true, returnOriginal: false };
  
  return mongoConnection
      .collection('current_date')
      .findOneAndUpdate(query, update, queryOptions)
      .then(mongoResult => mongoResult.value.updated_at)
}