The Moons of Giasis is the calendar structure for the When the Fires Broke Through universe. There are twelve moons a year and each moon's turn is considered thirty days time. Nempur, Eeccess, and Ihphy's Archipelago refer to each moon by the name Giasis, the goddess of the moon, named them. Although Mystos recognizes the Moons of Giasis, they usually refer to each moon as the number moon within the year.
Below is the chart for the Moons of Giasis.
| Moon of Giasis | Number Moon |
|---|---|
| New Moon | First Moon |
| Snow Moon | Second Moon |
| Sugar Moon | Third Moon |
| Pink Moon | Fourth Moon |
| Flower Moon | Fifth Moon |
| Honey Moon | Sixth Moon |
| Thunder Moon | Seventh Moon |
| Lightning Moon | Eighth Moon |
| Harvest Moon | Ninth Moon |
| Hunters Moon | Tenth Moon |
| Frost Moon | Eleventh Moon |
| Old Moon | Twelfth Moon |