Just make sure that you aren't looking for the
time of broadcast. Not all explore give you the time of broadcast of the transsaction.
There is no such a thing as "time of broadcast". In a peer-to-peer network some nodes receive messages later than others. This is why Bitcoin needed a timestamp server. So that time will be determined by one node; not any, but the one which worked more.
Is that the confirmation time?
Yes. If you check block 808877, you can verify it yourself. It was mined in 2023-09-22 18:13 UTC.