Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

Ablative:—
1. cōnstitūtā diē, on the appointed day; prīm˘ lūce, at daybreak.
2. quotā hōrā, at what o'clock? tertiā vigiliā, in the third watch.
3. “tribus proximīs annīs ” (Iug. 11) , within the last three years.
4. “diēbusvīgintī quīnque aggerem exstrūxērunt ” (B. G. 7.24) , within twentyfive days they finished building a mound.
Accusative:—
1. diēs continuōs trīgintā, for thirty days together.
2. “cum trīduumiter fēcisset ” (B. G. 2.16) , when he had marched three days.

[*] Note.--The Ablative of Time is locative in its origin (§ 421); the Accusative is the same as that of the extent of space (§ 425).