I already posted about this in a now deleted review on the Play Store, sorry about that. I love this app and I’d like to stop using the trakt website on mobile, but sometimes I need to because Moviebase is missing this feature.
How I would implement it: when you tap the check mark a card should appear asking you when you you watched the movie. Alternatively if not everyone likes this, instead of simply tapping, long press the check mark.
I know you can change the date afterwards, but that’s a pain, I don’t want to bother to do that.