Sims 4 Relationships

@Neethling7 Unfortunately I am not aware of any such stat/feature, and I just went in my game to check and still don't see anything for tracking the number of days you've known or dated someone in Sims 4. Other relationship details are there, but not that. You may or may find the following resources helpful. It's possible there could be a Mod (check on MTS) that does something like this.

• There are some (other) stats you can find:
  Select the sim in the household screen (live play) > Simology > Stats
• Romantic relationship information: https://www.carls-sims-4-guide.com/relationships/romance.php

Sorry I didn't have the answer you were hoping for. Monitor this post, as someone else may know of and add something else. 

I'm afraid there's no such feature in the game, but there is a script mod on MTS that shows your Sims relationship scores and displays in-game time so it's easier to keep track of them. Just search for "RelPrint Console Cheats: Sims relationships in exact numbers". Hope that helps!