You must find 366 caches on the appropriate dates. They can be of any sort (but geocaching.com GC codes only), found at any time and be anywhere. (Remember that Feb 29 is a rare date.)
I shall verify suitability from the logger's statistics page. Logs that do not meet the criteria will be deleted.
As well as being a challenge, there is a puzzle aspect to this cache as well. If you do not positively know what the puzzle is and that you have solved it, you are advised to email the cache owner to confirm that you do qualify before travelling to do this cache. I don't want folk upset by a wasted journey. Normally I'll respond within 24 hours.
No spoilers in the logs please.
Congratulations to the Woking Wonders for both FTF and for persistence in the face of adversity.
Find 366 caches all on the same date of the month, any month or year. Log your find on that date of a month.
Good hunting. You may also be interested in my other caches.
It has become apparent that project-GC has created a checker for this puzzle-challenge. This has two flaws: (a) the checker is wrong, (b) if the checker were right, it would spoil the puzzle aspect. The Project-GC checkers are inappropriate here.