think:3 - the clock
This challenge is a lot easier than it looks like, it's important that you get to know the clock before you submit your answer, as this challenge is time based.
The clock consists of 5 rows, each stands for either month,day,hours,minutes or seconds, if you refresh the challenge a couple of times you should see how it works.
Also there's an easier way to complete this challenge, not gonna tell though... 

Good Luck!