Definition of "originally aired"?

[Seraldis]

Hi,

is there a definition of how to use "originaly aired" for episodes of TV Series?
My question referes to "Das Boot" (ID: 352822). All episodes of the new season 2 have been officially released on april 24th at Skys streaming platforms Sky Ticket and Sky Q. Sky also airs two of these episodes per week at one of their Pay-TV Channels.
So my question is: What is the right date for "originaly aired"? At the moment all episodes carry the (future) dates of the Pay-TV Channel.

Thanks!

[Gilly]

The "originally aired" date on TVDB should match the date the episode was shown on a TV channel, not when it was made available to stream.