The feast of Saint Valentine was removed from the Catholic Church's universal liturgical calendar in 1969.
The change came during the revision of the General Roman Calendar after the Second Vatican Council. The revised calendar was promulgated by Pope Paul VI in 1969 and took effect in the new liturgical books from 1970. Saint Valentine's name was removed from the General Roman Calendar because reliable historical information about the saint was considered too limited.
This did not mean that the Catholic Church declared Saint Valentine unreal or ceased recognizing him as a saint. His name remains in the Roman Martyrology, the Catholic Church's official list of saints and blesseds commemorated by date. His observance may also continue in particular local calendars, such as those of places with a strong traditional association with him.
The revision also replaced the February 14 universal observance with the memorial of Saints Cyril and Methodius. Traditionalist Catholics using older liturgical books may still observe Saint Valentine on February 14. Other Christian traditions, including Anglican and Lutheran calendars, retain their own commemorations, so “removed from the universal calendar” is more precise than “removed from Christianity.”