Calendar

The calender in world of daventry apparently mirrors that of the Earth. In the official material references to Daventry's calendar are rarely mentioned. But references that exist it shares the same 12 month calendar of Earth and has roughly the same length of year. Further references suggest that weeks varies between five and seven days.

Background
Both May and November are referenced on tomb stones in King's Quest IV. However since the graveyards are said to have been brought over from the Other World, they are not indicative of a calendar in the world of Daventry. However, Kingdom of Sorrow also makes reference to Graham comparing the skin of a troll as being as gray as November rain, and Mayapples. In KQC it is specifically said that KQ4 takes place during the summer, which would follow information established in KQ3. it was said to have been playing a Maytime dance, which would imply that KQ4 may have taken place in May (however may would set the story in spring), and it is specifically said to take place during summer. However these references would seem to confirm that they are both months in Daventry's calendar.

A few details that can be gleaned include the length of days. According to King's Quest IV a day in the world of Daventry is 24 hours much like on earth (time in the game is a few seconds for every minute, and few minutes for every hour). Weeks are more unclear, only a few references mention the use of days during a week, though not length of week. For example it is said in the King's Quest Companion that the Village of the Crown's Bazaar is open three days a week (which would imply that a week is at least over three days). Weeks are mentioned in the King's Quest novels and known details support a five to seven day week. The book Housebreaking Dragons in Seven Days would seem to support a seven day week. The Compleat Works of William Shakespear mention "Sunday", but this isn't necessarily indicative of the names of the week in the world of Daventry (as the book originates from the other world).

There are fewer details surrounding months. In the Guidebook to the Land of the Green Isles, Derek speaks of leaving from Llewdor, and being on the ocean for a month and two weeks before he ended up in the Green Isles (this would imply that he was at sea for a month and a half). According to KQ6, Alexander traveled for three months before reaching the Green Islands. In KQ Companion it is explained that Alexander made a stop in Llewdor to speak to Derek while his ship was being readied. It's actually implied in the KQ3 chapter, that travel between Llewdor and Daventry probably no more than a day or two in good weather, or at least at the time of that story (the world is in flux and changes daily, likely including the size of the world). Once returning to Daventry, it took him three months to reach the Green Isles. Surprisingly it only took a little over a week for Alexander's crew to return back to Daventry.

In the King's Quest Companion within the King's Quest 3 chapter Alexander speaks of Manannan having had a special clock (a reference to the in-game clock) which Manannan follows for his routine (traveling to other nations, eating, sleeping, etc). Thus it is implied Manannan used a different timescale than what was usually normal for the World of Daventry. The time it kept was different from the time normally recognized in Daventry. It apparently runs differently in that universe, slower than it flows in the Other World. In KQ4, Rosella can read a grandfather clock in Whateley Manor (originally from the Other World), which the game calls "Tamir Time". She reads the time breaking it up into A.M. and P.M. (the game takes place from 6:00 AM to 6:00 AM the following day)

If Daventry occured on earth however then its likely that their time units would likely be roughly the same as those used on earth, or at least similar to one of the other cultural calendars used on earth (most earth calendar types use a 12 month calender with approximatley 30 day months). In that case it would mean that the time system that Manannan uses is based on some other timescale other than the ones used on earth.

The world of Daventry follows the traditional four seasons, of spring, summer, autumn, and winter. The dates of when the seasons normally begin is unclear. It is known for at least spring that Culatha brings the spring weather to Daventry (without her help winter weather would be perpetual). Queen Icebella is called the Queen of Winter, but it is unclear if that has an meaning other than the fact that she lives in a kingdom of perpetual ice that stretches across Great Mountains. The druids of the Isle of the Mists keep the Green Isles in an eternal spring, and a tropical climate. It is also said that Alexander played a springtime dance suggesting that the game takes place during the spring. This is not indicative of the seasons in other regions however. Throughout the novels there are occasional references to the weather patterns by season. For example it is suggested that during winter, in November there are grey rains in Daventry (so snow comes a little later).

Additionally there are locations within Daventry such as the Old Wood where time doesn't necessarily follow regular patterns due to influence of Faery magic (or at least it seems as if time moves at a different rate). For example time in the Old Woods seems to move quicker than outside the woods. So someone who is in the woods could be there for minutes but, hours, days, years could have passed outside of the woods, so trying to lock time in those locations down onto a regular calender would be nearly impossible. But this seems to mainly affect the feelings of those in the woods, rather than actual affect of time (mortals lose track of time while under the effect of the magic), the fairies are capable of suppressing that magic if need be, to prevent people from losing track of time (for example when Valanice travelled into the Old Wood, during the endless winter, the fairies told them they made sure that they would be leaving the woods it wouldn't be much longer than they entered).