Timekeeping in the Lunar Lands

Just a quick worldbuilding post today on the calendar system I use for my main campaign setting. The idea is to create something flavorful and fantastic, but still recognizable enough to the players. This allows them to utilize what they themselves know about time, scheduling, and how it works without needing to be pointed out that a week is actually ten days and for them to need to remember that. Much of this is just for reference and doesn't necessarily come up in-game - but I know it's there, and that's what matters.

Years

Years in the Lunar Lands are not numbered from a specific date; rather, they are charted relative to the reigning Vardessian Emperor at the time. Years in which a new Emperor takes the throne are considered both the nth Year of their reign and the First Year of their successor's reign, and the titles are used interchangably.

Thus, the "current" year in my campaign is the Twenty-Fourth Year of Harald IV's Reign (abbreviated 24HLD4). The year in which he took the throne can be regarded as the First Year of Harald IV's Reign (1HLD4) or the Forty-Ninth Year of Leopold III's Reign (49LPD3). Years prior to the founding of the Vardessian Empire are counted backward - thus, the First Year of Gustav I's Reign (1GST1) was proceeded by the First Pre-Imperial Year (PE1), which was proceeded by the Second Pre-Imperial Year (PE2), and so on.

Months

The Lunar Lands uses a lunar calendar - months are measured from the first night of a new moon to the first night of the subsequent new moon, using the largest of the three moons for reference. There are twelve months in a year, and Midwinter (the winter solstice) is regarded as the new year. If this does not fall on a new moon, the remaining days between Midwinter and the next new moon form an intercalary month at the beginning of the new year. Generally, months are thirty days, but may be longer or shorter depending on the lunar cycle. These months, and their corresponding real-world months, are:

Frostmoon: January

Snowmoon: February

Windmoon: March

Seedmoon: April (the time of planting)

Flowermoon: May

Fallowmoon: June

Haymoon: July (the time where hay is made)

Harvestmoon: August

Barleymoon: September

Winemoon: October

Bloodmoon: November (the time the livestock is slaughtered)

Oakmoon: December

Weeks
A week is seven days, and there are usually four weeks per month. Each day of the week is sacred to a different god, and their temples tend to hold rites on those days. These days, and their corresponding real-world days, are:

Sunday: Sunday. Sacred to Solenna.

Moonsday: Monday. Sacred to Mondi, god of the moon and husband to Solenna.

Huntsday: Tuesday. Sacred to Kerne.

Fieldsday: Wednesday. Sacred to Eostre.

Starday: Thursday. Sacred to Torvald.

Kingsday: Friday. Sacred to Voltan.

Queensday: Saturday. Sacred to Marseah.

Days
Days are measured from midnight to midnight. There are 24 hours per day, with 12 AM being midnight and 12 PM being noon.

Holiday 
Different kingdoms and cultures celebrate different civil and folk holidays, ranging from local festivals to grand official fetes. However, almost every culture observes the Wheel of the Year, a series of holidays plotted around the solstices and equinoxes (quarter days) and the midpoints between them (cross-quarter days). Because these dates are important for agriculture, they are celebrated in most regions, though the customs of celebration are variable and multifaceted, and they may be celebrated in different ways. These dates are:

Imbolc (First of Snowmoon): A cross-quarter day marking the start of spring. Festivals celebrate the end of winter and the rebirth of life, and oaths are traditionally made to be completed in the coming summer. Many also visit oracles in this time to learn of what the coming year will bring.

Eostrefest (Spring Equinox): A quarter day corresponding to the midpoint of spring. This day is associated with Eostre, the goddess of fertility, and the greatest celebrations of her cult are held then to ensure good crop yields in the fall.

Beltane (First of Flowermoon): A cross-quarter day marking the start of summer. Cattle are sent out to pasture on this day, often garlanded in flowers, and bonfires are often lit in celebration. This is one of the two dates at which the borders between this world and the realms beyond are at their weakest, making it easier for beings to cross between worlds. For this reason, it is often celebrated as Hexennacht - Witches' Night - as it is a popular date for rituals and summonings to be performed. In western Vardessy, it is celebrated as Saint Kriemhild's Day, largely in response to this.

Midsummer (Summer Solstice): A quarter day celebrating the longest day of the year. It is the most sacred day in the cult of Solenna, goddess of the sun. Devotees spend much of this day outside observing the sun's path.

Lammas (First of Harvestmoon): A cross-quarter day marking the official start of the harvest season. Typically celebrated with great feasts, often held outside on hilltops, in which the first fruits of the harvests are offered as a sacrifice to the gods. In many towns, elaborate festival days have grown around this feast, with public markets, contests, and performances held.

Mabon (Fall Equinox): A quarter day marking the midpoint of autumn, and the end of the harvest season. Also a time of feasting and thanking the gods for the harvest, though usually a more solemn affair than Lammas, as the days begin to get shorter thereafter and all must start to prepare for winter.

Samhain (First of Bloodmoon): A cross-quarter day marking the start of winter. Most notably, it is one of the two days at which the borders between this world and the realms beyond are at their weakest, allowing beings from other planes to most easily be contacted or summoned. This includes the shades of the Land of the Dead, and it is known that Morthanos, god of the dead, and his agents roam the roads on this day in search of souls that have escaped his domain. For many revelers, this is commemorated by walking the roads in costume. In Valossa, it is also the holy day of the Lady of Death, a local funerary goddess, in which people make offerings to their ancestors.

Midwinter (Winter Solstice): A quarter day celebrating the longest night of the year. In the dead of winter, it is often spent inside with much feasting and merriment to keep the morale during the cold, dead season, and to inspire hope for the spring to come. This date marks the end of the current year and the start of the next.