mobile-session-promise/utils/calc_derived_tstamp.js

The modules creates a promise that resolves an existing or creates a brand new session

"use strict";
// Derive the timestamp in accordance with https://snowplowanalytics.com/blog/2015/09/15/improving-snowplows-understanding-of-time/#derived-ts
// module.exports = function (body) {
module.exports = (collector_tstamp, device_created_tstamp, device_sent_tstamp) => {
  return collector_tstamp - (device_sent_tstamp - device_created_tstamp);
}