Calendar

In the calendar on Roshar, there are ten months in a year, ten weeks to a month, five days to a week.Book signing, Omaha, NE, 3/13/14 Both the months and the weeks are named after the numbers in the Ars Arcanum. See additional connections under the ten essences.
==Seasons==
Weather and seasons are unpredictable, typically lasting a few weeks each. The Weeping, however, is consistent; it marks the end of an old year, and the coming of a new one, with four weeks of constant rain. There are no highstorms during the Weeping. Gemstones cannot be infused during the Weeping, which can be problematic to the people of Roshar, and especially the Knights Radiant.
The Weeping is so consistent, that it is used to determine people's ages as well. However, after the Parshendi release the Everstorm, the Weeping alternately stops and restarts repetitively. It acts strange, like regular weather, rather than the long, mild highstorm it is supposed to be.
Even so, following the Weeping, people often find as many dead plants around the town as they do after a strong highstorm.
Lightday is the single clear day in the middle of the Weeping. Every other year a highstorm arrives on Lightday, but it is otherwise free of storms. The years without the highstorm are known as Light Years.
Midpeace is a period opposite the Weeping, also when there are no highstorms. The Middlefest fair in Jah Keved is held during Midpeace.
==Table of Listed Months==
Both the months and the weeks are named after the numbers in the Ars Arcanum. The names of the months are variations of the week and month names. It is unknown if the variations are language based or if there is some other reason.
===Month Names by Endings===
 	Number	Month	ah (Palah ?)	shah (Palah ?)	ach
( Chach?)	ash (Shash?)	
an(Nan?)	anes 	es
(Jes?)	ev
(vev?)
1 	Jes 	 	 	 	 	 	Jesnan 	 	 	Jesachev
2 	Nan 	 	 	 	 	 	 	 	Nanes 	
3 	Chach 	 	 	 	 	 	Chachanan	 	 	
4 	Vev 	 	 	 	Vevahach 	 	 	 	Vevishes 	Vevanev
5 	Palah 	 	 	 	 	 	Palahevan	 	Palaheses	Palahishev
6 	Shash 	Shash	 	 	 	 	Shashanan	 	 	Shashabev
7 	Betab 	Betab	 	 	 	 	Betabanan	Betabanes	 	
8 	Kak 	 	Kakevah 	Kakashah 	Kaktach 	Kakash 	 	 	Kakakes 	Kakanev
9 	Tanat 	 	 	 	Tanatesach	 	 	Tanatanes	Tanates 	Tanatanev
10	Ishi 	 	 	 	 	 	Ishashan 	 	 	
==Complete Calendar==
This table contains the assumed names of every day of the year, every month of the year, and every day of the week. These names are extrapolated from the patterns found in the novels of The Stormlight Archive.
 	 	 	 		Day 	Day 	Day 	Day 	Day
 	 	 	 		1 	2 	3 	4 	5
Month	Month	Week	Week 		Jesel 	Nanel 	Chachel 	Vevel 	Palahel
1 	Jes 	1 	Jeses 		Jeseses 	Jesesan 	Jesesach 	Jesesev 	Jesesah
1 	Jes 	2 	Jesan 		Jesanes 	Jesanan 	Jesanach 	Jesanev 	Jesanah
1 	Jes 	3 	Jesach 		Jesaches 	Jesachan 	Jesachach 	Jesachev 	Jesachah
1 	Jes 	4 	Jesev 		Jeseves 	Jesevan 	Jesevach 	Jesevev 	Jesevah
1 	Jes 	5 	Jesah 		Jesahes 	Jesahan 	Jesahach 	Jesahev 	Jesahah
1 	Jes 	6 	Jesash 		Jesashes 	Jesashan 	Jesashach 	Jesashev 	Jesashah
1 	Jes 	7 	Jesab 		Jesabes 	Jesaban 	Jesabach 	Jesabev 	Jesabah
1 	Jes 	8 	Jesak 		Jesakes 	Jesakan 	Jesakach 	Jesakev 	Jesakah
1 	Jes 	9 	Jesat 		Jesates 	Jesatan 	Jesatach 	Jesatev 	Jesatah
1 	Jes 	10 	Jesish 		Jesishes 	Jesishan 	Jesishach 	Jesishev 	Jesishah
 	 	 	 		 	 	 	 	
2 	Nan 	1 	Nanes 		Naneses 	Nanesan 	Nanesach 	Nanesev 	Nanesah
2 	Nan 	2 	Nanan 		Nananes 	Nananan 	Nananach 	Nananev 	Nananah
2 	Nan 	3 	Nanach 		Nanaches 	Nanachan 	Nanachach 	Nanachev 	Nanachah
2 	Nan 	4 	Nanev 		Naneves 	Nanevan 	Nanevach 	Nanevev 	Nanevah
2 	Nan 	5 	Nanah 		Nanahes 	Nanahan 	Nanahach 	Nanahev 	Nanahah
2 	Nan 	6 	Nanash 		Nanashes 	Nanashan 	Nanashach 	Nanashev 	Nanashah
2 	Nan 	7 	Nanab 		Nanabes 	Nanaban 	Nanabach 	Nanabev 	Nanabah
2 	Nan 	8 	Nanak 		Nanakes 	Nanakan 	Nanakach 	Nanakev 	Nanakah
2 	Nan 	9 	Nanat 		Nanates 	Nanatan 	Nanatach 	Nanatev 	Nanatah
2 	Nan 	10 	Nanish 		Nanishes 	Nanishan 	Nanishach 	Nanishev 	Nanishah
 	 	 	 		 	 	 	 	
3 	Chach	1 	Chaches 		Chacheses 	Chachesan 	Chachesach 	Chachesev 	Chachesah
3 	Chach	2 	Chachan 		Chachanes 	Chachanan 	Chachanach 	Chachanev 	Chachanah
3 	Chach	3 	Chachach		Chachaches	Chachachan	Chachachach	Chachachev	Chachachah
3 	Chach	4 	Chachev 		Chacheves 	Chachevan 	Chachevach 	Chachevev 	Chachevah
3 	Chach	5 	Chachah 		Chachahes 	Chachahan 	Chachahach 	Chachahev 	Chachahah
3 	Chach	6 	Chachash		Chachashes	Chachashan	Chachashach	Chachashev	Chachashah
3 	Chach	7 	Chachab 		Chachabes 	Chachaban 	Chachabach 	Chachabev 	Chachabah
3 	Chach	8 	Chachak 		Chachakes 	Chachakan 	Chachakach 	Chachakev 	Chachakah
3 	Chach	9 	Chachat 		Chachates 	Chachatan 	Chachatach 	Chachatev 	Chachatah
3 	Chach	10 	Chachish		Chachishes	Chachishan	Chachishach	Chachishev	Chachishah
 	 	 	 		 	 	 	 	
4 	Vev 	1 	Veves 		Veveses 	Vevesan 	Vevesach 	Vevesev 	Vevesah
4 	Vev 	2 	Vevan 		Vevanes 	Vevanan 	Vevanach 	Vevanev 	Vevanah
4 	Vev 	3 	Vevach 		Vevaches 	Vevachan 	Vevachach 	Vevachev 	Vevachah
4 	Vev 	4 	Vevev 		Veveves 	Vevevan 	Vevevach 	Vevevev 	Vevevah
4 	Vev 	5 	Vevah 		Vevahes 	Vevahan 	Vevahach 	Vevahev 	Vevahah
4 	Vev 	6 	Vevash 		Vevashes 	Vevashan 	Vevashach 	Vevashev 	Vevashah
4 	Vev 	7 	Vevab 		Vevabes 	Vevaban 	Vevabach 	Vevabev 	Vevabah
4 	Vev 	8 	Vevak 		Vevakes 	Vevakan 	Vevakach 	Vevakev 	Vevakah
4 	Vev 	9 	Vevat 		Vevates 	Vevatan 	Vevatach 	Vevatev 	Vevatah
4 	Vev 	10 	Vevish 		Vevishes 	Vevishan 	Vevishach 	Vevishev 	Vevishah
 	 	 	 		 	 	 	 	
5 	Palah	1 	Palahes 		Palaheses 	Palahesan 	Palahesach 	Palahesev 	Palahesah
5 	Palah	2 	Palahan 		Palahanes 	Palahanan 	Palahanach 	Palahanev 	Palahanah
5 	Palah	3 	Palahach		Palahaches	Palahachan	Palahachach	Palahachev	Palahachah
5 	Palah	4 	Palahev 		Palaheves 	Palahevan 	Palahevach 	Palahevev 	Palahevah
5 	Palah	5 	Palahah 		Palahahes 	Palahahan 	Palahahach 	Palahahev 	Palahahah
5 	Palah	6 	Palahash		Palahashes	Palahashan	Palahashach	Palahashev	Palahashah
5 	Palah	7 	Palahab 		Palahabes 	Palahaban 	Palahabach 	Palahabev 	Palahabah
5 	Palah	8 	Palahak 		Palahakes 	Palahakan 	Palahakach 	Palahakev 	Palahakah
5 	Palah	9 	Palahat 		Palahates 	Palahatan 	Palahatach 	Palahatev 	Palahatah
5 	Palah	10 	Palahish		Palahishes	Palahishan	Palahishach	Palahishev	Palahishah
 	 	 	 		 	 	 	 	
6 	Shash	1 	Shashes 		Shasheses 	Shashesan 	Shashesach 	Shashesev 	Shashesah
6 	Shash	2 	Shashan 		Shashanes 	Shashanan 	Shashanach 	Shashanev 	Shashanah
6 	Shash	3 	Shashach		Shashaches	Shashachan	Shashachach	Shashachev	Shashachah
6 	Shash	4 	Shashev 		Shasheves 	Shashevan 	Shashevach 	Shashevev 	Shashevah
6 	Shash	5 	Shashah 		Shashahes 	Shashahan 	Shashahach 	Shashahev 	Shashahah
6 	Shash	6 	Shashash		Shashashes	Shashashan	Shashashach	Shashashev	Shashashah
6 	Shash	7 	Shashab 		Shashabes 	Shashaban 	Shashabach 	Shashabev 	Shashabah
6 	Shash	8 	Shashak 		Shashakes 	Shashakan 	Shashakach 	Shashakev 	Shashakah
6 	Shash	9 	Shashat 		Shashates 	Shashatan 	Shashatach 	Shashatev 	Shashatah
6 	Shash	10 	Shashish		Shashishes	Shashishan	Shashishach	Shashishev	Shashishah
 	 	 	 		 	 	 	 	
7 	Betab	1 	Betabes 		Betabeses 	Betabesan 	Betabesach 	Betabesev 	Betabesah
7 	Betab	2 	Betaban 		Betabanes 	Betabanan 	Betabanach 	Betabanev 	Betabanah
7 	Betab	3 	Betabach		Betabaches	Betabachan	Betabachach	Betabachev	Betabachah
7 	Betab	4 	Betabev 		Betabeves 	Betabevan 	Betabevach 	Betabevev 	Betabevah
7 	Betab	5 	Betabah 		Betabahes 	Betabahan 	Betabahach 	Betabahev 	Betabahah
7 	Betab	6 	Betabash		Betabashes	Betabashan	Betabashach	Betabashev	Betabashah
7 	Betab	7 	Betabab 		Betababes 	Betababan 	Betababach 	Betababev 	Betababah
7 	Betab	8 	Betabak 		Betabakes 	Betabakan 	Betabakach 	Betabakev 	Betabakah
7 	Betab	9 	Betabat 		Betabates 	Betabatan 	Betabatach 	Betabatev 	Betabatah
7 	Betab	10 	Betabish		Betabishes	Betabishan	Betabishach	Betabishev	Betabishah
 	 	 	 		 	 	 	 	
8 	Kak 	1 	Kakes 		Kakeses 	Kakesan 	Kakesach 	Kakesev 	Kakesah
8 	Kak 	2 	Kakan 		Kakanes 	Kakanan 	Kakanach 	Kakanev 	Kakanah
8 	Kak 	3 	Kakach 		Kakaches 	Kakachan 	Kakachach 	Kakachev 	Kakachah
8 	Kak 	4 	Kakev 		Kakeves 	Kakevan 	Kakevach 	Kakevev 	Kakevah
8 	Kak 	5 	Kakah 		Kakahes 	Kakahan 	Kakahach 	Kakahev 	Kakahah
8 	Kak 	6 	Kakash 		Kakashes 	Kakashan 	Kakashach 	Kakashev 	Kakashah
8 	Kak 	7 	Kakab 		Kakabes 	Kakaban 	Kakabach 	Kakabev 	Kakabah
8 	Kak 	8 	Kakak 		Kakakes 	Kakakan 	Kakakach 	Kakakev 	Kakakah
8 	Kak 	9 	Kakat 		Kakates 	Kakatan 	Kakatach 	Kakatev 	Kakatah
8 	Kak 	10 	Kakish 		Kakishes 	Kakishan 	Kakishach 	Kakishev 	Kakishah
 	 	 	 		 	 	 	 	
9 	Tanat	1 	Tanates 		Tanateses 	Tanatesan 	Tanatesach 	Tanatesev 	Tanatesah
9 	Tanat	2 	Tanatan 		Tanatanes 	Tanatanan 	Tanatanach 	Tanatanev 	Tanatanah
9 	Tanat	3 	Tanatach		Tanataches	Tanatachan	Tanatachach	Tanatachev	Tanatachah
9 	Tanat	4 	Tanatev 		Tanateves 	Tanatevan 	Tanatevach 	Tanatevev 	Tanatevah
9 	Tanat	5 	Tanatah 		Tanatahes 	Tanatahan 	Tanatahach 	Tanatahev 	Tanatahah
9 	Tanat	6 	Tanatash		Tanatashes	Tanatashan	Tanatashach	Tanatashev	Tanatashah
9 	Tanat	7 	Tanatab 		Tanatabes 	Tanataban 	Tanatabach 	Tanatabev 	Tanatabah
9 	Tanat	8 	Tanatak 		Tanatakes 	Tanatakan 	Tanatakach 	Tanatakev 	Tanatakah
9 	Tanat	9 	Tanatat 		Tanatates 	Tanatatan 	Tanatatach 	Tanatatev 	Tanatatah
9 	Tanat	10 	Tanatish		Tanatishes	Tanatishan	Tanatishach	Tanatishev	Tanatishah
 	 	 	 		 	 	 	 	
10 	Ishi 	1 	Ishies 		Ishieses 	Ishiesan 	Ishiesach 	Ishiesev 	Ishiesah
10 	Ishi 	2 	Ishian 		Ishianes 	Ishianan 	Ishianach 	Ishianev 	Ishianah
10 	Ishi 	3 	Ishiach 		Ishiaches 	Ishiachan 	Ishiachach 	Ishiachev 	Ishiachah
10 	Ishi 	4 	Ishiev 		Ishieves 	Ishievan 	Ishievach 	Ishievev 	Ishievah
10 	Ishi 	5 	Ishiah 		Ishiahes 	Ishiahan 	Ishiahach 	Ishiahev 	Ishiahah
10 	Ishi 	6 	Ishiash 		Ishiashes 	Ishiashan 	Ishiashach 	Ishiashev 	Ishiashah
10 	Ishi 	7 	Ishiab 		Ishiabes 	Ishiaban 	Ishiabach 	Ishiabev 	Ishiabah
10 	Ishi 	8 	Ishiak 		Ishiakes 	Ishiakan 	Ishiakach 	Ishiakev 	Ishiakah
10 	Ishi 	9 	Ishiat 		Ishiates 	Ishiatan 	Ishiatach 	Ishiatev 	Ishiatah
10 	Ishi 	10 	Ishiish 		Ishiishes 	Ishiishan 	Ishiishach 	Ishiishev 	Ishiishah
===Formulation===
Each of the ten months, ten weeks and five days are referred to as numbers named in the Ars Arcanium. To refer to a specific day of the year, the base month is appended with the suffix for the week, then the suffix for the day is appended. 
# 	Name 	Suffix
1 	Jes 	es
2 	Nan 	an
3 	Chach	ach
4 	Vev 	ev
5 	Palah	ah
6 	Shash	ash
7 	Betab	ab
8 	Kak 	ak
9 	Tanat	at
10	Ishi 	ish
For example "Vevishes" (The Way of Kings: Chapter 6) -
Vev-ish-es
Vev = 4th month
ish (Ishi) = 10th week of the month
es (Jes) = 1st day of the week
===Inconsistencies===
There are some inconsistencies with the pattern when compared to a couple of days as written within The Way of Kings. This may be due to some spelling variations inherent in the language.
A week referred to as "Jesnan" in The Way of Kings would be "Jesan" according to this pattern.
A day referred to as "Kaktach" in The Way of Kings would be "Kakatach" according to this pattern.
Otherwise the pattern seems to hold true.
==Theory==
The weeks and months of the year also follow this chart, but they're all named after numbers. A few notes about the Rosharan calendar: for the first few epigraphs in The Way of Kings, they're dated with the week and month. For example, the Prologue therein has an epigraph from week Palah of month Shash. Later, the week and month are combined; such as Ishashan, which would be week Ishi of month Nan. Weeks and months are not noted in the chart, since they're exactly the same as the numbers. There seem to be ten weeks for each of the ten months. Each week is five days, which means that the year is at least five-hundred days long.
(User neverearth from the defunct stormblessed.com posted this theory on the calendar.)
THE MONTH, WEEK, AND DAY ARE ALL BLENDED TOGETHER. In the above example (Ishashan) the month is Ishi(10) week Shash(6) and day Nan(2)
===Week-Month Pairings===
Weeks are across the top months working down. An asterisk * has been added to those placed in possibly two or more places.
 	Jes 	Nan 	Chach 	Vev 	Palah 	Shash 	Betab 	Kak 	Tanat 	Ishi
Jes 	Jeses 	Nanes	Chaches 	Veves 	Palaheses 	Shashes 	Betabes 	Kakakes 	Tanates 	Ishes
Nan 	Jesnan 	 	Chachanan	 	 	Shashanan 	Betabanan 	 	 	Ishashan
Chach	Jesach 	 	 	Vevahach	 	 	 	Kaktach 	Tanatesach	
Vev 	Jesachev	 	 	Vevanev 	Palahishev *	Shashabev*	 	Kakanev 	 	
Palah	Jesah 	 	 	 	 	 	 	Kakashah	 	
Shash	Jesash 	 	 	 	 	 	 	Kakash 	 	
Betab	 	 	 	 	 	Shashabev*	 	 	 	
Kak 	Jesak 	 	 	 	 	 	 	 	 	
Tanat	 	 	 	 	 	 	 	 	 	
Ishi 	Jesish 	 	 	Vevishes	Palahishev* 	 	 	 	 	
@@@ 	 	 	 	 	 	 	Betabanes (Jes?)	Kakevah 	Tanatanes 	
@@@ Those so marked do not fit any specific month that is obvious, nor do they conflict with another name.
===Days of the Week===
As there are five weekdays, they are likely named after variations of the first five numbers, Jes, Nan, Chach, Vev and Palah. The only weekdays named in the books (as of Words of Radiance) are Jesel and Chachel, the first and third days of the week.
==Notes==
There is a detailed Roshar date system here.
According to Brandon, the calendars for all worlds within the cosmere are different from one another.Starsight Release Party, Orem, UT, 11/26/19
==Additional/External Links==
* On-site, there is a chronology for major events and character timelines.
* Off-site, there is a cosmere timeline here.
==Q&A with Brandon==
Q. If Roshar's years are 500 days along, and I say someone is twenty years old, how does that equate to Earth time?
A. It equates to actually about 10% difference. Because while the years are 500 days, the days are shorter, and there are fewer months. It all works out mathematically to about 10%. So if I say someone is twenty in the books, they are twenty-two in Earth years. So kind of keep that in mind.
It's a small enough difference, I feel, that people who don't notice it or know about it won't really be thrown for a loop. But I like to have things like that. And normally in fantasy novels I don't make big differences in things like time, units of measurement. Or other things, like Roshar has a lower gravity than Earth. I don't deal with that in a lot of the fantasy books; I like to have some of it on Roshar, because one of my pitches to myself in making Roshar was to come up with a fantasy book where the worldbuilding was a little more like a science fiction book's worldbuilding.Tor Instagram Livestream, 11/25/20
==References==
Category:Ten
Category:Seasons
Category:Culture