Log files with name: "Date Unkown"

🧪 Flight Testing & Log Analysis
1

Hello everyone,

Recently we whilst viewing our log files we are getting quite a few with “Date Unkown”, as the file name. Approximately 50% of our log files are named like this now, which is rather strange. I would like to include one but unfortunately the site doesn’t allow the upload of .ulg or .txt files.

Does anyone know what could cause this behaviour?

Kind regards,

Tijmen Kroezen

2

You can upload ulog files to https://logs.px4.io and then paste the link here.

I would guess that this happens if you don’t have GPS and the Pixhawk does not have the time (anymore) either because it never had a time set or because it has no RTC battery, or the RTC battery is empty.

3

Ah great, here it is: https://logs.px4.io/plot_app?log=55881a2b-265a-4000-8277-64e75ecc1062

4

Is there a way around it in case i’m not using GPS?
Can I update the time in any other way?

5

Yes, you can set it in the Nuttshell using the system_time command:

You can get the shell using mavlink_shell.py or in QGroundControl.

6

Thanks! I will try that as soon as possible