Most of what we know about the calendar comes from the 883 Flathead Calendar included in Zork Zero.
The Quendorian year is divided into twelve months. In 883, these months were of similar length to those of the Gregorian calendar used on Earth, except for FrobuaryTR, which observed Antharian Leap Week.
The months are named:
On the 883 calendar, FrobuaryTR 29 is listed as Start of Leap Week (Antharia only)
, and the month has 35 days.
Leap weeks come to be observed in the Frigid River Valley as well, since Zork Grand Inquisitor begins on 32 FrobuaryTR 1067.
A letter in the Zork ⅠⅠⅠ packaging is dated 33 Suspendur 947. If not a misprint, this suggests that leap weeks do not always occur in FrobuaryTR.
Since 883, 947, and 1067 are 64 and 120 years apart, we may assume leap weeks occur every four years, as in the Gregorian calendar, though not on years that are multiples of four.
As in the Gregorian calendar, days are grouped into seven‐day weeks. The days of the week are named:
These are the known holidays and festivals. Dates are based on their observances in the year 883.
| Date (883 GUE) |
Day | Holiday | Analog | Source |
|---|---|---|---|---|
| 1 Est | Entharion Day | New Year’s Day | Zork Zero calendar | |
| 3 Fro | Frob | Undergroundhog’s Day | Groundhog Day, 2 Feb | Zork Zero calendar, ZGI (diary) |
| 29 Fro | Start of Leap Week (Antharia only) | Leap Year, 29 Feb | Zork Zero calendar | |
| 11 Arc | Star | St. Balhu’s Day | Zork Zero calendar | |
| 3 Ora | King Wurb’s Birthday | Zork Zero calendar | ||
| 4 Ora | Grue | St. Foobus’s Day | Zork Zero calendar | |
| 22 Ora | Coronation Day | Zork Zero calendar | ||
| 0 Mag | Zero Day | Zork Zero calendar | ||
| 1 Mag | Mage Day | May Day, 1 May | Zork Zero calendar, ZGI (diary) |
|
| 6 Mag | Star | Antharian Marble Pageant | Zork Zero calendar | |
| 31 Mag | Wand | St. Honko’s Day | Zork Zero calendar | |
| 4 Jel | Filfre Day | Independence Day (USA) | Zork Zero calendar | |
| 25 Jel | Grue | St. Quakko’s Day (maybe) | Zork Zero calendar | |
| 6 Aug | Sand | St. Bovus’ Day | Zork Zero calendar | |
| 4 Sus | 1st Mud | Leisure Day | Labor Day, 1st Mon in Sep | Zork Zero calendar |
| 11 Sus | Mud | Double Fanucci Championships [1st week in autumn] | Zork Zero calendar | |
| 6 Ott | Frob | St. Wiskus’ Day | Zork Zero calendar | |
| 11 Mum | Star | Veterinarian’s Day | Veteran’s Day (USA) | Zork Zero calendar |
| 14 Mum | Curse Day | Zork Zero calendar, ZGI (diary) |
||
| 25 Dis | some ancient holiday |
Christmas | Z:TUU |