Find at least one cache on every date of every month of the year. For this challenge, that means 366 days as you must find a cache on leap day in a leap year. These days do not have to be consecutive nor in the same calendar year. You just have to have found a cache on 366 different dates including leap year (every date of the year including Feb. 29th).
In your "Found it" log, please provide proof of meeting the challenge requirement OR make reference to your geocaching.com public profile page showing your "Finds for Each Day of the Year Grid". Found it logs without proof of qualification will be deleted!