Calendar Date Formatting

The Phidas Calendar Formatting is a universally consistent structure, though only ever primarily used in its fully written structure in papers of high formality or that require immensely precise information (such as certain theses created by various wizards).
The calendar structures of Phidas is and have been determined by various factors. The three primary ones are listed below:

The Basics: Individual Days, Months and Years operated on a strictly consistent schedule, due to the prevalence of existent chronomantic magics that made a basic requirement for a universal time system all civilisations could be built upon.

Seasons: Most prevalently seen in Pre-Arcanos documentation, though still used in agricultural, meteorological, festival and certain druidic documentation. The primary four seasons are the most often seen, though Ardorfall and Hearthwake's presence of Kalypso make it of some note to certain magical or religious documentation

The Arcanos: The magic-defining calamity of the Arcanos acts as a universal marker that can be found across all documentation in all civilisations alive for its occurrence. This cornerstone, and the development of technology and new magics in response to it, is hence treated as the centre of the modern calendar structure, with events preceding and following marked by their relation in the year to this event.

The most common versions of calendar formatting in the years post 1000 PA are represented as follows:

Basic Formatting: DD/MM/YY

This is the most common form of date formatting used in the Phidas World, acting as the type found in the margins of student papers, standard day-to-day business papers and the various other pieces of daily written life.

Official Formatting: D of the M, YYYY (BA/PA if relevant)

This is the formatting typically reserved for official documents or papers, simply being the fully written out equivalent of the greatly simplified Basic Formatting.

Traditional Formatting: D of the M, YYYY (BA/PA if relevant). [Phase of Moon] Auria, [Phase of Moon]/Absent Kalypso

This formatting is most commonly seen in documents created within the time frame between 500 BA to 1,000 PA, although the majority of higher education spellcasting and religious documents also specify the phases of the moon due to the prevalence of Phidas' moons in their respective practices.
For the stretch of time before 500 BA, most civilisations operated on unique time-keeping methods if they recorded year dates. The most common ones involved eponymous leaders, relations to seasons, relations to more primal myths or naming them after legendary figures and leaders in a civilisation's past.