I did this and used:
ts = heartRateMonitor.timestamp;
now = Date.now();
As you can see I got wildly different times. I would have thought the the heart rate timestamp would have been synced to the watch time???
[22:35:15]ts: Sun Jan 04 1970 21:16:05 GMT+11:00 now: Mon Nov 13 2017 22:35:10 GMT+11:00
Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.