Why virus database updates will lag a day?

Ahh, here china. See the title.

I’m afraid I don’t understand the question.

-= Did you mean “Why are updates delayed by a day…?”

-= From what I know, Avast is set to check for updates for every 300 minutes… As long as an update is available it will download the update & check again the next 300 minutes…

-= I once got 2 updates in one day… One in the morning & one in about dawn… So, maybe, its just a matter of availability of updates…

I still do not understand what this guy from china want.

At the present time, could it be already June 1 in China but May 31 where the updates originate? If so, he will get the May 31 update(s) on June 1 thus looking like a delay.