New puzzle any soon?

"APX_919;c-1790350" wrote:
A man is stranded on a deserted isle with only sand in all directions. All he has are his clothes and a calendar.

6 months later a ship passes by and finds the man healthy and alive on the isle. How?

There's a huge stockpile of food to the south, a stockpile of water to the north, and an excellent shelter to the east, but the only thing that's in all directions is sand.