Times

I see that Traccar Client sends just one time stamp which is used as both devicetime and fixtime. Fair enough.

But elsewhere in these forums I read that Traccar Server expects to receive UTC times yet the times I see are the phone's local times, in my case BST. Is there a setting somewhere I have missed to make Client send UTC? If not it seems to me that there is an opportunity for confusion if non-Traccar Client devices are sending UTC and but Traccar Client devices aren't.

Traccar Client should be sending UTC timestamp. Can you please provide some evidence that it doesn't.

Here's the last entry in the server log from a few minutes ago. It's now 1752 BST:

2018-09-11 17:50:15 DEBUG: [3cb2e4ce: 5055 < 62.3.226.214] HEX: 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
2018-09-11 17:50:15 DEBUG: [3cb2e4ce: 5055 > 62.3.226.214] HEX: 485454502f312e3120323030204f4b0d0a636f6e74656e742d6c656e6774683a20300d0a0d0a
2018-09-11 17:50:15  INFO: [3cb2e4ce] id: 645714, time: 2018-09-11 17:50:13, lat: 50.84068, lon: -0.93048, course: 0.0

I should have added 1752 BST is 1652 UTC.

Here is the timestamp that device sends:

timestamp=1536684613

It converts to 16:52 UTC, so your claim is incorrect.

So where does 'time: 2018-09-11 17:50:13' in the log and the exact same fixtime in tc_positions come from? Does Traccar Server adjust device timestamps to the server's local time?

Of course it prints it in server local time.

So to clarify, Traccar server expects devices to provide times in UTC and then converts them to local time for storage in the database and server log. I guess if you want the times to stay as UTC you need to run the server in UTC.

Database also usually stores UTC, but it depends on the database engine.