How to set requirement for first join date?

Hi, i am trying to set a requirement that will check if player joined first time 3 years ago as a minimum, so i can give him "old player" rank automatically with ExecutableEvents plugin, but i can't understand, how can i compare values to get a result (inferior or equals), how to get a correct date value from %player_first_join% or %player_first_played% so i can get if he played 3 years or more?