which dates should be used?

Which is the preferred release date to be used?

I noticed that some series have both a weekly release and a complete series release on an online platform. 

Series 2 of the UK drama "After the Flood" had episode #2.1 broadcast on the UK ITV channel on Sunday 18 January 2026, with episode #2.2 to be shown on Monday 19 January 2026. 

Episodes #2.3 & #2.4 will be broadcast on Sunday 25 January 2026 & Monday 26 January 2026 and episodes #2.5 & #2.6 on the Sunday 1 February 2026 & Monday 2 February 2026.

The complete series was also released on the ITV online platform on Sunday 18 January 2026.

Which release date should be used when creating a page for each episode?