Timezone Issue: Devices Showing Different Timezones (UTC vs 11 Hours Behind)

Hi Team,
I'm facing a timezone issue with some of my devices in Traccar. A few devices are showing timestamps in UTC, while others are showing times that are 11 hours behind the current time. I want all devices to display timestamps in a consistent timezone (preferably UTC or local time).

Can you please guide me on:

Whether this is a device configuration issue or a server-side setting?

How can I force all devices to use the same timezone?

Any recommended settings in traccar.xml or device commands?

Most likely device configuration issue. For most devices Traccar expects to receive UTC time.

For some protocols it's possible to override this on the server side.

Hi Anton,

Thanks for the quick response.

To ensure consistency, could you please guide me on how to identify which devices are sending non-UTC timestamps? Is there a log, field, or pattern I should look for to confirm this on a per-device basis?

Also, for protocols where server-side override is possible:

Could you specify which protocols support this?

How can I configure the override in traccar.xml?

Is there a recommended way to apply this setting for all devices?

I'd also appreciate any tips on sending device commands (if needed) to update the timezone configuration on the device side.

Thanks again!

To see which protocols support server override you would have to check the source code.

Configure in the configuration file. Make sure you read the documentation.