Sundays: The Gloria is said on Sundays except those of Advent, Septuagesima, Lent, and Passiontide.
Feasts: It is said on feasts of III class or higher, or equivalent (such as the Mass of a mystery or saint which is not per se III class, but which is assigned to the day either as a commemoration or by inclusion in the Martyrology, and the celebrant opts to celebrate that Mass instead of the ferial Mass).
Ferias: It is said when the seasonal color is white (from Christmas until January 13, and from Easter until Pentecost), even if the ferias are IV class.
Votives: It is said on votives of III class or higher (but not if vestments are violet), on IV class votive of the Angels on any day, and of the BVM on Saturday.
Omitted: It is omitted whenever violet vestments are worn, in Requiem Masses, and in most Masses of IV class (with exceptions above).
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