The worlds of Jaern and Cahyali have similar calendars, but their seasons and holidays tend to differ. Jaern, being a mostly tropical planet with vast oceans, has a notably different global climate than Cahyali, which is more temperate. The days of the week and months are the same, however.

Weeks have six days, and months have thirty days each. A year is exactly ten months, or 300 days.

Most dates you will find referring to historical events use the “Founding Calendar”, counting its years since the founding of the civilization of Aldeberon on ancient Torandor, and the founding of imperial Dahabu on Cahyali. The Founding Calendar is most commonly used in scholarly circles and academics, as its dates are the same across both Jaern and Cahyali. However, the common people don't often use this calendar. Dates on the Founding Calendar are denoted as BF (Before Founding) and SF (Since Founding).

On Jaern, most count their years from the year that the Kaaren of Destruction landed on Geleia, Jaern from Torandor (on 7812 SF). This is known as the Arrival Calendar, and dates are denoted as BA (Before Arrival) and AA (After Arrival). One can convert from the Founding Calendar to the Arrival Calendar by subtracting 7812 from the Founding date.

On Cahyali, most count their years from the Day of Solar Wrath, the date that the Dahabu Empire fell (on 7524 SF). This is known as the Solar Calendar, and dates are denoted as BW (Before Wrath) and SW (Since Wrath). One can convert from the Founding Calendar to the Solar Calendar by subtracting 7524 from the Founding date.

No matter which epoch event is used, the months, days, and weeks remain consistent across all calendar systems.

Jaern has three seasons, although none become particularly cold except in the polar regions.

• Akvofojo: The rainy season and the planting season. The coldest of all Jaern's seasons, often overcast even on days when it doesn't rain. Jaernians associate Akvofojo with rebirth, life, and new beginnings.
• Fajrofojo: The hot season and the growing season. Temperatures can soar during this season, and fires become common in more inland areas. Jaernians associate Fajrofojo with the sun, discovery, and relaxation- most educational institutes grant their students a major break in mid-Fajrofojo, for about half the month of Led. Fajrofojo is significantly shorter than the other months, and is considered a sort of transition period between Akvofojo and Sekafojo.
• Sekafojo: The dry season and the harvest season. During this time, temperatures fall and deciduous trees can begin to lose their leaves. The end of Sekafojo, after harvest, is considered a time when evil spirits and demons can be let into the world. Jaernians associate Sekafojo with change, endings, and abundance.

Most of Jaern's holidays are guided by priesthoods of gods. Religious life and holiday is very intermixed in Jaernian culture, with the populace going from temple to temple to pay their respects during major holidays.

This holiday does not have a set date each year. Once the new year comes and the month of Gorn begins, Neptunites eagerly await the first rainfall of the year. When the first drops strike the ground, the temple declares the start of Akvofojo. Neptunites race outside and play in the rain, before heading back to the temple and enjoying a great feast in honor of Neptune.

This holiday is marked on the calendar but not commonly celebrated outside of Ra'ite circles. It marks the nearest approach of Onra, the sun, and the shortest day on Jaern. Ra'ites are solemn during this day, working carefully in their temples to prepare for any calamities that may occur. According to superstition, dark forces can enter the world on the shortest day, and many circles of evil gather their forces.

The anniversary celebrated by the faction of True Justice of when T’or regained his place of power, and blessed the true believers who sought true justice, refusing to blindly follow the law. A mass celebration is held at the place of Rebirth, which is located at the Rougtero Stockade.

Celebrated by Isisites, this day commemorates when Isis returned to Jaern in 10048 and cured the lands of a plague that had been ravishing it. The Day of Rebirth is a rather toned-down holiday, with many celebrating quietly at home and perhaps visiting a local temple of Isis to pay respects.

A celebration of all that is living. Food, singing, dancing, and storytelling occur throughout Isisite sanctuaries. Patients are brought down to the worship areas if they are able, entertainers are retained, and every caterer in town is employed. Games and competitions are held for groups and individuals, and prizes awarded.

This holiday is marked on the calendar but not commonly celebrated outside of Ra'ite circles. It marks the farthest approach of Onra, the sun, and the longest day on Jaern. Ra'ites open their temples and celebrate on this day, marking the occasion with food, wine, and complex dances meant to imitate the movement of heavenly bodies and pay respect to Ra.

During this holiday, priests of Osiris observe a Jaern Week. They speak in public about the wonders of nature. They explain why it is important, why people need to depend on nature, and what they can do to preserve it. They teach those who are willing what they can do to preserve the wild, giving respect to Osiris in the process. It is considered a good omen to host a priest during this time, and some noble families vie for the honor.

The day that all the T’orites take to remember all of the fallen comrades that have died in the line of duty. It is a solemn day for the T’orites, but it reminds them of the price that Justice sometimes demands.

This is the day when Tarus first showed himself to high priest Justin Gheler, beginning the resurgence of Tarusian worship to Jaern. On this day, adults feast while children prepare and display signs of their knowledge. After the feast, the children’s exhibits are judged by the elder priests, and the best are chosen. These children are rewarded, and immediately invited to apply for entry into the Archive.

Celebrated by Zepherinite temples, this holiday is held as a massive sporting event beginning on the 29th and taking place over the course of a week. Athletes train for months preparing for the Day of Creation, and travel into major cities to compete with the best from all around. Sports such as ballgames, footraces, and swimming is traditionally included, but more recent additions have been made such as fencing, archery, and gymnastics.

Dedicated to all those who have passed on in the previous year, this is a very beautiful and enrapturing ceremony. Thousands of candles are lit, choirs sing sonorous songs about the afterlife, and a rich repast of rare and delicious foods is served. This holiday can be solemn, much of it devoted to remembering the dead and celebrating their legacies. During this festival, busy Anubians get a respite from their neverending jobs, and take the time to relax and unwind.

The leap year of Jaern. Every ten years, a three day holiday is added to the end of the year (Pim 31, 32, and 33) to adjust the calendar by the fractional days which have accumulated. Being born during this holiday is considered very lucky. Many Jaernians do not work during this holiday.

The Festival of the Foretelling is significant to At'enites, who meditate on the first day, seeking inspiration and guidance from their goddess. On the second day, this vigil ends and temples hold large feasts, and at the end of these feasts a temple's high priest comes out to preach and divine future events for the populace. On the third day, the festival winds down as At'enites spend time with their loved ones and celebrate life.

The many countries of Cahyali celebrate too many local holidays to be feasibly listed down, but there are a few internationally notable ones. Cahyali's seasons are similar to Earth, although their winters and summers can last slightly longer.