Valentine's day is on Winter 14. You don't receive anything on this date, but you can give until you can't give anymore! On this day you can give Chocolates to the boys you like. You can buy Chocolate from Jeff's General Store for 100 G a piece, and even gift wrap them for another 100 G.
In this version of the event, you can give chocolate to every guy you come across in town! The bachelors you give Chocolate to will remember the gift and return on Spring Thanksgiving (Spring 14) to give you cookie gifts. You only get cookies from Cliff, Gray, Doctor, Rick, and Kai, even if you gave chocolates to every guy you came across that day.