No, singular possesive. There's only one St. Valentine and it's his day.
valentines day!
Valentines day.
Officially, Valentines Day is not a holiday at all - it is an observation.
Valentines day
valentines day?
valentines day
Valentines Day
Valentines Day was for Saint Valentine. Most stores just wanted to make it a holiday so they could get money by selling candy so they started the holiday Valentines day on the feast day of Saint Valentine
Henry VIII declared valentines day a holiday in 1537
his favorite holiday is Valentines Day
No, pagans like myself do not consider valentines day a holiday.
Valentines Day.