This is a bug found in the wick forums.
When I look at days of old posts, they’re usually in the 15th to the 18th of a certain month or something. I found that kinda weird… but looking at the very first post ever made on the wick forums:
Visit that link… it says @Jilno’s post was on September 17th, 2017, but he joined on September 22nd, 2017… his profile also says that the last time he posted was the same day and year he joined wick… but that post was made before he even joined wick… it’s almost like the time is broken 
And check the post again, it says it was made in 2018, then look at @zrispo’s profile there, it says he joined September 22nd, 2017, and @Luxapodular joined 2017, September 20th, but believe it or not, that topic was created BEFORE they joined the wick forums!
I believe that they joined in 2015, b/c as I remember, the last time I checked, it was 2015, so plz let me know @Luxapodular or @zrispo if I’m right or not.
