I wanna sync time from Gcs(PC) to Ardupilot

Hello, I am programmer. I am making GCS these day.

I saved some logs, but I saw timestamp has Unix Time(1970.01.01) from any msg.

But I need real time. So I want to sync time from GCS to Ardupilot.

I figured out Mavlink has TimeSync Msg. So I send TimeSync Msg to Ardupilot, but I have same problem.

How can I sync time from Gcs to Ardupilot??

Use the SYSTEM_TIME to actually set time. I think there is a param that must be set otherwise Ardupilot attempts to use GPS.