The feast is found only in the special calendar of some diocese and religious orders, and is celebrated with proper Mass and Office either on the third Sunday of July or on 23 October.
Vespers Hymn: Conditor alma siderum
Lauds Hymn: Salutis humanae Sator
See Liber Usualis pg. 852 Verses 1,2,4 with doxology Qui natus…
From Liber Antiphonale, 1912