@Silvers_Rayleigh said:

1. If we go to edit and then episodes we land here: https://www.themoviedb.org/tv/1399-game-of-thrones/season/1/edit?active_nav_item=episodes

For me, this editing page appears correct. I correctly see April 17, 2011 for the first episode.

@superboy97 said:

For me, this editing page appears correct. I correctly see April 17, 2011 for the first episode.

After reading your reply, I went and I changed my timezone in the settings. I set it to Detroit and the "problem" was indeed gone. So this issue is timezone related. But, I still think of it as a bug and the biggest reason for this is that it's not universal.

@Silvers_Rayleigh said:

Note: The bug is exclusive to this particular editing page and doesn't occur when editing a standalone episode.

Now, I'm not saying that it should be, I'm just saying that's the way it is. When I edit a series using this editing page and if my timezone is set to London (for example), I am unintentionally setting the wrong date. For me, the solution to this problem would be to have the same date everywhere regardless of the time zone.