A calendar of saints forms a way of organising a liturgical year on the finely-granulated level of days by assigning each day to association with a saint. This calendar system, when combined with major church festivals and movable and immovable feasts, constructs a very human and personalised yet often localised way of organising the year and identifying dates. Compare Roman Missal.

Medievalists continue the old tradition of dating by saints' days: their works may appear "dated" as "The Feast of Saint Martin" or "Lammastide". Poets such as John Keats commemorate the importance of The Eve of Saint Agnes. Many children acquire baptismal or confirmational names from the saint associated with their date of birth, baptism or confirmation, and believing Eastern Orthodox Christians mark the "name day" of the saint whose name they bear with special attention.

Some traditional dates (Roman Catholic unless otherwise indicated) include:

See also: Namesdays in Sweden