Update time of disruption data?

Friends, I would like to know what time zone the disruption_counts update is tied to

I noticed that it does not depend on the airline airport position,
Here is an example (time=UTC)

… and these times are for any airport.

The data should show daily updates, and as you can see I have it between 4a.m and 5a.m.
I need to reconcile the time to work correctly