Holiday Day of Week Chart

Year 5631

Possible This year (5631) Never
Rosh Hashanah ראש השנה
Sep 26, 1870
S
M
T
W
T
F
Sh
Yom Kippur יום כיפור
Oct 5, 1870
S
M
T
W
T
F
Sh
Sukkos סוכות
Oct 10, 1870
S
M
T
W
T
F
Sh
Hoshana Rabba הושענא רבה
Oct 16, 1870
S
M
T
W
T
F
Sh
Shemini Atzeres שמיני עצרת
S
M
T
W
T
F
Sh
Simchas Torah שמחת תורה
S
M
T
W
T
F
Sh
Chanukah חנוכה
Dec 19, 1870
S
M
T
W
T
F
Sh
Tu BiShvat ט״ו בשבט
Feb 6, 1871
S
M
T
W
T
F
Sh
Purim פורים
Mar 7, 1871
S
M
T
W
T
F
Sh
Pesach פסח
Apr 6, 1871
S
M
T
W
T
F
Sh
Shavuos שבועות
May 26, 1871
S
M
T
W
T
F
Sh
17 Tammuz י״ז בתמוז
Jul 6, 1871
S
M
T
W
T
F
Sh
Tisha B'Av תשעה באב
Jul 27, 1871
S
M
T
W
T
F
Sh

How does this work?

The Jewish calendar follows fixed arithmetic rules that determine which day of the week each holiday can fall on. There are exactly 14 possible year types (keviyot / קביעות), each determining the day of the week for every holiday in that year.

Lo ADU — לא אד״ו

Rosh Hashanah never falls on Sunday, Wednesday, or Friday. This prevents Yom Kippur from being adjacent to Shabbos and Hoshana Rabba from falling on Shabbos.

Lo BaDU — לא בד״ו

Pesach never falls on Monday, Wednesday, or Friday. This is a mathematical consequence of Lo ADU combined with the structure of the year.

AT BASH — א״ת ב״ש

A mnemonic pairing holidays that always fall on the same day of the week: Tisha B'Av = 1st day Pesach, Shavuos = 2nd day Pesach, Rosh Hashanah = 3rd day Pesach, Simchas Torah = 4th day Pesach, Yom Kippur = 5th day Pesach, Purim (previous) = 6th day Pesach.

Holiday Details for 5631

Rosh Hashanah א׳ תשרי
Monday
Sep 26, 1870
Yom Kippur י׳ תשרי
Wednesday
Oct 5, 1870
Sukkos ט״ו תשרי
Monday
Oct 10, 1870
Hoshana Rabba כ״א תשרי
Sunday
Oct 16, 1870
Shemini Atzeres כ״ב תשרי
Simchas Torah כ״ג תשרי
Chanukah כ״ה כסלו
Monday
Dec 19, 1870
Tu BiShvat ט״ו שבט
Monday
Feb 6, 1871
Purim י״ד אדר
Tuesday
Mar 7, 1871
Pesach ט״ו ניסן
Thursday
Apr 6, 1871
Shavuos ו׳ סיון
Friday
May 26, 1871
17 Tammuz י״ז תמוז
Thursday
Jul 6, 1871
Tisha B'Av ט׳ אב
Thursday
Jul 27, 1871