Hashiversary achievement

alternate name suggestion: Geohashiversary achievement

Award yourself this achievement for geohashing on the day of year of your first expedition in any of the following years.

Ribbon suggestion

still needs a better wording, imo

This user earned the Hashiversary achievement by visiting a hash point exactly on the day of her first expedition.

with some parameters set:

This user earned the 5th Hashiversary achievement by visiting a hash point in the 5th year after the day of his first expedition.