Custom Calendars
This page contains the different calendar systems I've made, including the one you see on the main page. It gets pretty detailed but I will try to make it simple enough to understand for you.
Custom Calendars
This page contains the different calendar systems I've made, including the one you see on the main page. It gets pretty detailed but I will try to make it simple enough to understand for you.
Aetherian Calendar
Example: Windday, 31st Mistlea 12026 HE [N]
Version: 2.1
This once started as a month rename for the Gregorian Calendar in mid-2024, so it was just an alternate naming scheme for the calendar we all are used to (unless you are in another country with a different calendar system). However, in April 2026 it has been updated to use two different proposals in this calendar as well, making it separate from the Gregorian Calendar now.
This is the one you are seeing on the home page of this website, and you are likely here because you want to know how this all works. Well, this is the section for you!
First off, what are the months named? Well, this depends on whether you are in the northern hemisphere or the southern hemisphere, because the names were made specifically for the seasons for both of these hemispheres.
For the northern hemiphere, the names are Aurora (1), Frostvale (2), Galea (3), Mistlea (4), Sunlea (5), Solara (6), Aetheris (7), Moltilis (8), Amber (9), Russet (10), Mystic (11), and Solstice (12). Galea is pronounced "Gale-la," Mistlea is pronounced "Mist-lee-a," and Sunlea is pronounced "Sun-lee-a"; all the rest are pronounced exactly as written here.
For the southern hemisphere, the names are Zenithra (1), Flarevale (2), Amber (3), Russet (4), Mystic (5), Solaris (6), Australis (7), Frostilis (8), Galea (9), Mistlea (10), Sunlea (11), and Solstice (12). Galea's, Mistlea's, and Sunlea's pronunciations haven't changed other than swapping placements with Amber, Russet, and Mystic; Solstice is hemisphere neutral, and the other five are either altered or new.
This doesn't take into account every possible seasonal difference (i.e., April feels like Winter somewhere) so to avoid too many branching paths, I just stuck with two variants.
And that was it for pretty much over a year and a half. Well, only Amber through Aurora were locked in at the time; Frostvale was named Amora at the time, and March through August stayed untouched until sometime in mid-2025, when they were renamed and Frostvale was created. But now, in April 2026, I have gained an interest in different calendar proposals and decided to bring the World Calendar and the Holocene Era into this.
To keep it short, the World Calendar is an alternative calendar structure that evens out all four quarters of the year to be as equivalent as they can. The 1st, 4th, 7th, and 10th months are 31 days long, while the rest are 30 days long, making a 364-day calendar. The 365th day is added as a blank day after the 30th of Solstice, and the leap day is now between the 30th of Solara and the 1st of Aetheris. For my calendar in specific, the day after the 30th of Solstice is the 31st of Solstice, and the leap day is the 31st of Solara.
The Holocene Era (or the Human Era) is basically our current CE/AD year plus 10,000, so the eras of this calendar would be mid-12024 HE, mid-12025 HE, and April 12026 HE, respectively. This is pretty well known if you've watched someone that uses this in some places, like Kurzgesagt, but now I want to bring this canonically to Aetherian! The pronunciation of the years from HE also applies to Aetherian. The only thing different in Aetherian is years below 0 HE like -2000 HE, while that is still needed for any kind of computing; visually, it is changed to 2000 BHE for human comprehension. If you want to know why this is pretty significant, you can watch Kurzgesagt's video on the matter.
Now, the last part of this whole calendar is what the weekdays are. Well, given how different Aetherian is compared to Gregorian, I figured I would give the weekdays a refresh as well. They are Sunday (1), Moonday (2), Windday (3), Skyday (4), Fireday (5), Starday (6), Dreamday (7), and Voidday (8). Only the first 7 are in the standard week; the 8th weekday is used ONLY for the blank days like 31 Solara and 31 Solstice.
Because of Voidday, the weekdays in the Gregorian calendar drift by one or two every year, but in terms of what the calendar difference between Aetherian and Gregorian is, this is what to expect (for non-leap years):
1 Aurora Aetherian = 1 January Gregorian
1 Frostvale Aetherian = 1 February Gregorian
1 Galea Aetherian = 3 March Gregorian
1 Mistlea Aetherian = 2 April Gregorian
1 Sunlea Aetherian = 3 May Gregorian
1 Solara Aetherian = 2 June Gregorian
1 Aetheris Aetherian = 2 July Gregorian
1 Moltilis Aetherian = 2 August Gregorian
1 Amber Aetherian = 1 September Gregorian
1 Russet Aetherian = 1 October Gregorian
1 Mystic Aetherian = 1 November Gregorian
1 Solstice Aetherian = 1 December Gregorian
For leap years:
1 Aurora Aetherian = 1 January Gregorian
1 Frostvale Aetherian = 1 February Gregorian
1 Galea Aetherian = 2 March Gregorian
1 Mistlea Aetherian = 1 April Gregorian
1 Sunlea Aetherian = 2 May Gregorian
1 Solara Aetherian = 1 June Gregorian
1 Aetheris Aetherian = 2 July Gregorian
1 Moltilis Aetherian = 2 August Gregorian
1 Amber Aetherian = 1 September Gregorian
1 Russet Aetherian = 1 October Gregorian
1 Mystic Aetherian = 1 November Gregorian
1 Solstice Aetherian = 1 December Gregorian
Because this used the World Calendar structure, 1 Aurora, 1 Mistlea, 1 Aetheris, and 1 Russet always start on Sunday; 1 Frostvale, 1 Sunlea, 1 Moltilis, and 1 Mystic always start on Skyday; and 1 Galea, 1 Solara, 1 Amber, and 1 Solstice always start on Starday, no matter the year.
Now, I know there are people that want STRICT 7-day weekdays with no interruptions due to a tradition they do on a specific weekday that they don't want drifting by one every year, and while I understand that, you could just say your thing happens every weekday you choose, and then things that still run off a 7-day timer can still count like normal. It wouldn't be as big of a deal, but I still appreciate your concern regardless. If that is something you can deal with, and you'd like a little change of pace in how you write dates on your personal documents and whatnot, why not use this?
Speaking of dates, whichever date format you use normally for Gregorian dates also applies to Aetherian. It's not like this is strictly Day/Month/Year; you can use Month/Day/Year, Year-Month-Day, and whatever other date formats are out there. Just... make sure you put either "[N]" or "[S]" after the whole date to signify what hemisphere month variant you're using.
You can optionally add an ordinal quarterly code after the day and month. 1 Aurora through 30 Galea is 1A through 91A; 1 Mistlea through 30 Solara is 1B through 91B; 1 Aetheris through 30 Amber is 1C through 91C; and 1 Russet through 30 Solstice is 1D through 91D. 31 Solara (leap year only) is labeled LD (Leap Day) and 31 Solstice is labeled YE (Year-End). For casual use of this calendar, it's not recommended to use this, but for more technical uses, it may be of use.
This is the mapping of the ordinal quarterly code compared to the normal calendar structure:
1-31 Aurora = 1A-31A
1-30 Frostvale = 32A-61A
1-30 Galea = 62A-91A
1-31 Mistlea = 1B-31B
1-30 Sunlea = 32B-61B
1-30 Solara = 62B-91B
31 Solara = LD (Leap Day)
1-31 Aetheris = 1C-31C
1-30 Moltilis = 32C-61C
1-30 Amber = 62C-91C
1-31 Russet = 1D-31D
1-30 Mystic = 32D-61D
1-30 Solstice = 62D-91D
31 Solstice = YE (Year-End)
Example date: Voidday, 31 Solstice (YE), 12026 HE [N]
Without ordinal numbering: Voidday, 31 Solstice 12026 HE [N]
Metric Calendar
Example: Aerotrod, 41st Quadember 2000 PM [10M50D24]
Version: 1.1
This one is much more tech-savvy than the previous calendar, as it uses pretty much entirely new units of time I made. The purpose of this is to be used for virtual sandbox environments, so this one is not meant to be used in the real world but can still be useful for said sandbox purposes that are not tied to our history. You know, OUR long history as a human species? Anyway, enough yapping; let's get into it.
This starts with the existence of metric time. If you haven't heard of metric time before, here's a brief overview:
A metric day is split into 10 hours. Standard days are split into 24 hours.
Each metric hour is split into 100 minutes. Standard hours are split into 60 minutes.
Each metric minute is split into 100 seconds. Standard minutes are split into 60 minutes.
You can see the time comparison between metric and standard time here.
Now, that is just regular time made metric, but what about my units? Well, to explain my variant of the seconds, I have to put on my nerdy glasses for that, but hang on, I do have a casual way to capture the feeling of this variant.
Enter Cession, not to be confused with "session." These are made to equal exactly 10,000,000,000 energy oscillations in a cesium atom; seconds are 9,192,631,770 energy oscillations in a cesium atom. The general length of seconds is typically counting up by one and saying the word "Mississippi" in between; for cessions, there's about an 80-90 millisecond delay after saying "Mississippi." That's how long cessions generally are for us.
The "minute" variant here is called a "centession." There are 100 cessions in a centession, and the oscillation count is exactly a trillion oscillations per centession.
The "hour" variant is called a "myression." Like the previous iteration, there are 100 centessions per myression, continuing the name trend, or 100 trillion oscillations long. There is no "AM" or "PM" system for myressions.
The way to denote the time format with these three units is actually similar to metric time, but instead of a colon, we use a small filled-in circle (•) between the units. An example is 4•17•85, which is 4 myressions, 17 centessions, and 85 cessions. The two left-hand units can still be pronounced "four seventeen," for example, just like standard time.
Unlike standard time, adding extra numbers with the separator does not denote the next actual units; instead, they represent "illusionary" units that continue the base-100 chunking you see with the previous three units. A new illusionary unit appears every 2nd power of 10 of myressions, like 10↑2 (100), 10↑4 (10,000), 10↑6 (1,000,000), etc. To pronounce this, let's take four examples: 2•17•08•00, 7•00•01•00, 4•21•03•20, and 11•21•00•01. The first example is "two seventeen 'o eight"; the second example is "seven zero 'o one"; the third example is four twenty-one 'o three"; and the fourth example is "eleven twenty-one zero one."
Moving past myressions, we have units that have a variable with a default length if no desirable length is chosen.
The first variable unit, which is the "day" variant, is called a "metrod." By default, it is 10 myressions long, but you can change it to be however long you want for your sandbox.
There are three units that are a group of metrods in them. These are "decanates," "hectanates," and "chilinates," which are 10, 100, and 1,000 metrods long respectively.
The next two variable units are called a "vector" and an "amnet," which are the "month" and "year" variants, respectively. By default, a vector contains 30 metrods and an amnet contains 12 vectors, but like metrods, you can change the duration of these two units, which, speaking of...
How you represent how long metrods, vectors, and amnets are is determined by what X, Y, and Z are in a notation known as XMYDZ. X means how many myressions are in a metrod, Y means how many metrods are in a vector, and Z means how many vectors are in an amnet. The default is 10M30D12. X, Y, and Z must be integers, however.
Unlike standard time, there are ten weekdays per calendar row, which are Aerotrod (1), Territrod (2), Pyrotrod (3), Hydrotrod (4), Umbritrod (5), Aquitrod (6), Lumitrod (7), Zephitrod (8), Cryomitrod (9), and Solitrod (10); there are also an indefinite number of vector names unlike traditional month structures due to the fact they are based on number prefixes and the factor amnets have a variable number of vectors, but for the purpose of this introduction, I will give the first 20 names and a general rule of thumb for future names.
The names are Monober (1), Bipril (2), Tripril (3), Quadember (4), Quintilis (5), Sextilis (6), September (7), October (8), November (9), December (10), Undecember (11), Dozember or Duodecember (12), Tredecember (13), Quadecember (14), Quindecember (15), Sexdecember (16), Sepdecember (17), Octodecember (18), Novedecember (19), and Vigintilis (20). The general rule of thumb for the rest is that each tens-digit increment uses "-tilis," while for the hundreds, prefixes with "cen" in them use "-tember," while the rest use "-tilis." For the ones, "quattuor" is shortened to "qua," "novem" is shortened to "nove," and "septen" is shortened to "sep" if "trigin" or "sep" is present right after the ones prefix; otherwise, it is "sept." The "ta" or "ti" part of the tens when combined with the hundreds is removed. Tier 2 zillion prefixes use "-nary," and the normal tier 2 prefix combining with tier 1 prefixes rules apply, but the tier 1 prefixes are the previously established vector names. Beyond that is no-man's-land.
Now let's talk about the date format. Believe it or not, the regional date formats the Gregorian Calendar has, like Day/Month/Year, Month/Day/Year, etc., also apply to the Metric Calendar. For the purpose of this introduction, I'll use Day/Month/Year... or would it be Metrod/Vector/Amnet? Anyway, the full date is structured as this: Aerotrod, 1 Monober 0 PM 0•00•00 [anyManyDany], which is the epoch for the start of the first stable main world, like the overworld. There are two states of amnets; AM amnets are amnets below zero, while PM amnets are amnets equal to or above zero. AM stands for "Ante-Metric," and PM stands for "Post-Metric."
There are also groups of amnets that are separate units. A group of 10 amnets is called a "denont"; a group of 100 amnets is called a "centicle"; a group of 1,000 amnets is called a "milennet"; a group of a million amnets is called a "meganet"; and this pattern continues with a quettanet having a nonillion amnets.
I hope this system could make creating sandbox scenarios more straightforward!
The symbols for each of these units are:
Cession: ċ
Centession: ċe
Myression: ṁ
Metrod: Ɱ
Decanate: DⱮ
Hectanate: HⱮ
Chilinate: CⱮ
Vector: Vr
Amnet: An
Denont: Dn
Centicle: Ct
Milennet: Ml (lowercase L)
Meganet: Mn