Calendar

Some aspects of the passage of time are similar, however, some of them vary significantely.

Arvine still function with seconds, minutes, and hours, however, the time frames in which things take place differ slightly.

Calendar
The Arvonian calendar was originated by The Angolé Scholars, which soon became Chromist, a group which measured the passing of time in Arvine, specifically deciding new ages, until their collapse at the end of the Ninth Age, and said end was their final act.

Timeframes
Arvine does not have time zones. It's day/night cycle is determined by the 'Marl', a set of Nárëcálë's Gems set in a ring about the planet. They are

geosynchronous with the planet, but rotate a full 360° in place (Specifically, in alternate clockwise/anti-clockwise association with its neighbour). In this way, when the gems are facing away from Arvine, the planet experiences its version of night. Most (but not all) dahl follow cicadian rhythm depending on these cycles.

Days in Arvine follow 18-hour cycles. Marlrise/Marlset vary depending on passing, but the 'highest' point is almost always 9 noon.

Instead of years, Arvine has 'annos'. As well as turning in place, the Marl 'pulsate', as they periodically get closer/further away from the planet. Each of these 'pulsations' lasts 175 days, and marks an anno on Arvine. It also gives rise to seasons. Dahl generally only recognise two seasons, both of which originating from Lifalagh terms in the first age: Saelment (Summer) and Iverment (Winter). In Lifalagh, the prefix Sael- refers to the god Nárëcálë, or more generally sun and light, while Iver- refers to the goddess Harmazatal, or more generally, frost and cold.

Passings
Arvine's moon is called Poical, and is used as a symbol of the goddess Valisilwen, as well as the god Lúamillë. It periodically (But not with a completely consistent timeframe) passes directly above the Centrasus Palace in Barbilunor as it orbits the planet, inside the Marl. Each time it does so marks a new Passing, Arvine's equivalent of months. The table below shows each Passing and its position in an anno:

General Convention
Arvine does not have weeks. Dates, even immediate ones, are generally referred to as their day within the anno. E.g, it is more common to see 104, Hall, rather than Hall 14. For more casual occasions, plans are simply made referring to 'how many days' time'.

Ages
Over long periods of time, Arvine's timeline is split into ages. Common folk tend not to regard these ages at all, as they are incredibly unlikely to see more than one in their lifetimes. However, they are readily used by historians, and the many semi-immortal figures that populate the planet. From its origin until its destruction, Arvine experienced 10 ages. When a new age began was decided by Chromist, and they coincide with major public events, e.g. Tamurel Skavo becoming High Queen, or the formation of The Shardfast Collective. Ages tended to be around 1,000 annos, but could be significantly shorter or longer.

A given anno in an age is referred to in shorthand. For example, the 824th anno of the 3rd age would be referred to as 3e 824.