The Torvish Calendar

Originally implemented around 89 1A by Sullia with the help of several notable Mantle priests of the time, the Torvish Calendar is the most widely accepted calendar in Kalin.
The Torvish Calendar is split into five primary parts: Years, Seasons, Months, Weeks, and Days.

Years

The Torvish Calendar follows a generally linear time keeping scale. Each year is followed by a successive year, with 1 going into 2, and 2 going into 3 and so on. Originally the years were split between the time before the Torva'Ir and the time after it began. In the first age this was denoted as AC (Ante Conditus, or Before Founding) and AAI (Aetas Autem Immortales, or Age Of Immortals). So for example the 50th year of what would now be called the First Age would've been 50 AAI, while 75 years before the founding of the Torva'Ir would've been 75 AC.
This changed with the dawn of the Second Age, as declared by Xune. As many know, the years are now based on age. So any year that is during the time of the Torva'Ir is denoted by 1A, 242 1A for example. Anything after the Fall of the Torva is denoted by 2A, 500 2A for example; while anything after The Return is designated as 3A. How this cycle may change when (or if) a fourth age is declared and accepted is unclear. So far, Xune has (whether purposefully or not) be the prime designator of when an Age starts and begins.
Each year is about 380 days long.

Seasons

Inside each year there are four seasons. Spring, Summer, Autumn, and Winter. These were originally known as Ver, Aestas, Autumna, and Hiems respectively, but the rise of Common as the primary language of Kalin has transitioned them into the better known words for the seasons.
These are the major delineators in each year, with the months and days falling below them. As one could guess they are tied inexorably to the seasons of Kalin. Though not every area of Kalin deals with the same length of natural Seasons universally (Aurelian winters are longer and harsher than Atresan ones, for example. Whereas Straka doesn't experience anything that could really be described as "winter like" weather). Each Season has five months that itself is made up of 19 days.

Months

Each season has the same five months as the others, that are separated by which season they are in. Each Month is 19 days long. The Months in each season are: Suthan (Named after Suthan), Solisa (named after the Torvish word for the sun), Lethaego (named after Lethaego), Lumena (named after the Torvish word for the moon), and Idiomar (named after Idiomar).
To differentiate exactly what month in what season one is speaking of usually months are said in combination with seasons. For example the fifth day of Solisa in Autumn would be written thusly: Autumn Solisa 5th, or The 5th of Autumn Solisa if one was writing it formally.

Weeks

Weeks do not flow perfectly into months, as every week is 5 days long and often months will end in the middle of a week or begin on a weekend. The five days of the week in order are Initium, Duri, Medius, Sero, and Terminus.
So for example the 7th day of Summer Idiomar could be written thusly:
Duri the 7th of Summer Idiomar.

Days

Each day is 24 hours long, denoted by sunrise and sunset.

The Final Order of the Calendar

Spring

1. Suthan
2. Solisa
3. Lethaego
4. Lumena
5. Idiomar

Summer

1. Suthan
2. Solisa
3. Lethaego
4. Lumena
5. Idiomar

Autumn

1. Suthan
2. Solisa
3. Lethaego
4. Lumena
5. Idiomar

Winter

1. Suthan
2. Solisa
3. Lethaego
4. Lumena
5. Idiomar