When you joined
It seems that Duolingo doesn't display when a user joined the site. So most people just guess, or check their browser's history. A few just accept the fact that they can't figure it out.
At first I just ignored that problem. But when somebody posted a discussion asking how to find their join date, I decided to check and find a solution.
Some of you already figured this out, but for those who don't know yet, here's the solution: check the source code. Oddly enough, you can find your join date in there! What's more, it doesn't matter which Duolingo page you start on - any page will work.
To find it, simply right-click and select "View page source". Then hit Ctrl+F and search for "creation_date". The join date will be right there.
Anybody interested in comparing join dates? It would be interesting to see who has the earliest join date. (I have 2013-08-07, or August 7.)
EDIT: Earliest user found in the comments: Mirima, 2012-03-21
2012-09-18 11:42:37, so almost a year now. Was pretty engaged when I first started, and then stopped for a while.
Back on track now though, with at least 100 points per day.
2012-07-20 02:15:30, I only started using it around Christmas though, so I think it could be the signup date? - strange..
April 2nd, 2013; "2013-04-02 20:00:25" I could have sworn I've been using Duolingo longer than that, but time flies when you are having fun.
Didn't work for me for some reason. Could it be because I'm using a Mac?
Nah, but it could be because of your browser. I can do this fine using Chrome on Ubuntu.
19th July 2013. I used the mobile app to join but this seems correct.Thanks for the tip!
That's odd. I wonder if Duolingo was experiencing technical issues when you joined? They could have put the wrong date in there.
July 20th, 2013 or "2013-07-20 18:38:52", which is correct (but not very early ^^" ). Thanks for sharing this trick!
"2012-03-31 21:40:56" Seems that I am the 'oldest member until now. I remember watching a TED-Ex video where it was announced. I started Spanish right away and I was very active until my vacation. I restarted this year after my visit to France.
Funny you should mention that. I signed up right after watching the same TED video on Netflix. It's a rather inspirational video, isn't it?
Thanks Timothy. My start date: 2018-01-11T21:04:31. Awesome. I was really curious.
This no longer seems to be available (2018-07-29)
EDIT You can still check this via Settings (hover your profile pic in the top-right) → Profile (sidebar) → There's an entry on the left called "Learning since"
I have been practising Japanese with Duo since 2017-06-01; 1 year, 1 month and 28 days now! (though I haven't for several months)