Were you looking for Dawn CoP Mission?
Some equipment and monsters change behavior depending on the Time of Day, and some quests can only be completed at certain hours in Vana'diel.
||Arco De Velocidad, Brisingamen (HQ), Clown's Subligar (HQ), Dandy Spectacles (HQ), Daylight Dagger, Fenrir items, Garden Bangles (HQ), Horror Head II, Ladybug Ring (HQ), Ladybug Earring (HQ), Louhi's Mask, Lycopodium Sash, Nocturnal mobs go to sleep, Sunlight Pole, Vampire Cloak
||Brisingamen (HQ), Clown's Subligar (HQ), Dandy Spectacles (HQ), Diurnal mobs go to sleep, Eerie Cloak +1, Fenrir items, Giant Bats spawn in outdoor areas, Horror Head, Louhi's Mask, Ninja Artifact Armor, Ninja Relic Armor, Nightmare Sword, Schwarz Axt, Shiranui, Vampire Boots, Vampire Cloak, Vampire Earring, Vampire Mask
|Dusk to Dawn
||Koga Hakama +1, Koga Hatsuburi +1, Koga Kyahan +1, Koga Tekko +1, Ninja Hakama +1, Ninja Kyahan +1, Rossignol, Hachiya Kyahan
||Magian Spectacles begin evaluating a new day
||Lovers in the Dusk
|Dead of Night
||Undead spawn in outdoor areas
- In-game dawn and dusk are different from their real-life counterparts in that the in-game ones are considered part of daytime rather than nighttime.