Converting Log TimeUS to human readible date time

Hi I’m analysing the logs and am looking at the raw data, but I can’t figure out what the time was for a log entry.

For example:
QTUN, 254980762, 0, 0, 0, 0.3393511, 0, 2.726521, 0, 0, 0.02, 0.1, 0, 2, 0

The second column, containing 254980762, is TimeUS and I’m assuming it’s the log time but I have tried all sorts of conversions, I can’t seem to find the actual YYYY-MM-DD HH:NN:SS. It’s not ms since GPS epoch (6 Jan 1980).

Does anyone know how to convert it?

It is µs since FC booted.

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Ah, so mission planner waits for the first GPS post of the UTC time and then syncs it. That’s how it’s able to show the date and time on the graph. Thank you.