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International Edit

Week days of some popular holidays[1]
Dom. Frequency *-01-01 *-01-06 *-02-14 *-05-01 *-11-01 *-12-25
C 43 ⇒ 10¾% W53-5 W01-3 W06-7 W17-6 W44-1 W51-6
CB 15 ⇒ 3¾% W17-7 W44-2 W51-7
B* 13 ⇒ 3¼% W53-6 W01-4 W07-1
B 30 ⇒ 7½% W52-6
BA 13 ⇒ 3¼% W18-1 W44-3 W52-1
A 43 ⇒ 10¾% W52-7 W01-5 W07-2
AG 15 ⇒ 3¾% W18-2 W44-4 W52-2
G 43 ⇒ 10¾% W01-1 W01-6 W07-3
GF 13 ⇒ 3¼% W18-3 W44-5 W52-3
F 44 ⇒ 11% W01-2 W01-7 W07-4
FE 14 ⇒ 3½% W18-4 W44-6 W52-4
E 43 ⇒ 10¾% W01-3 W02-1 W07-5
ED 14 ⇒ 3½% W18-5 W44-7 W52-5
D 44 ⇒ 11% W01-4 W02-2 W07-6
DC 13 ⇒ 3¼% W18-6 W45-1 W52-6
Week days of some national holidays, dow of original date highlighted
Dom. Frequency US France Germany
1776-07-04 1789-07-14 1990-10-03
C 43 ⇒ 10¾% W26-7 W28-3 W39-7
CB 15 ⇒ 3¾% W27-1 W28-4 W40-1
B* 13 ⇒ 3¼%
B 30 ⇒ 7½%
BA 13 ⇒ 3¼% W27-2 W28-5 W40-2
A 43 ⇒ 10¾%
AG 15 ⇒ 3¾% W27-3 W28-6 W40-3
G 43 ⇒ 10¾%
GF 13 ⇒ 3¼% W27-4 W28-7 W40-4
F 44 ⇒ 11%
FE 14 ⇒ 3½% W27-5 W29-1 W40-5
E 43 ⇒ 10¾%
ED 14 ⇒ 3½% W27-6 W29-2 W40-6
D 44 ⇒ 11%
DC 13 ⇒ 3¼% W27-7 W29-3 W40-7

North America Edit

In the Definition columns of the following table, ‘≺’ means ‘precedes’ and ‘≻’ means ‘follows’. A weekday abbreviation followed by a digit signifies the nth such weekday in the given month. Any last weekday of a month can be described as the weekday preceding the same first one in the following month.

Although there are a few month dates that can fall into three different weeks, this doesn’t apply to any of these holidays that are already specified by week or weekday (of month).

North-American holidays defined by week
Holiday Definition ISO week Fixed date
USA Canada Dow Original Dow ≻ Primary Alt. Sym454 Sym010 13mon
ML King Day 1 Mon 3rd / Jan Jan14 W04 57% W03 -01-22 -01-22 -01-22
Presidents Day Family Day 1 Mon 3rd / Feb Feb14 W08 86%  W07 -02-22 -02-20 -02-22
Mothers’ Day 7 Sun 2nd / May May07 W19 64% W18 -05-14 -05-12 -05-21
Victoria Day 1 Mon ≺ May25 May17 W21 96% W22 -05-22 -05-20 -06-01
Memorial Day 1 Mon Last / May May24 W22 96% W23 -05-29 -05-27 -06-08
Fathers’ Day 7 Sun 3rd / Jun Jun14 W24 82% W25 -06-14 -06-16 -06-28
Civic Holiday 1 Mon 1st / Aug Jul31 W32 75% W31 -08-08 -08-06 -08-22
Labor Day 1 Mon 1st / Sep Aug31 W36 82% W37 -09-01 -09-03 -09-22
Columbus Day Thanksgiving 1 Mon 2nd / Oct  Oct07 W41 54% W42 -10-08 -10-08 -11-08
Election Day 2 Tue ≻ Mon1 / Nov Nov01 W45 96% W44 -11-09 -11-07 -12-09
Thanksgiving 4 Thu 4th / Nov Nov21 W47 53% W48 -11-25 -11-23 -12-18
See also: North American Weekday Holiday Act

Easter Edit

 Week date of (non-Orthodox) Easter
ISO Sym454 Sym010 13*28 Frequency
-W12-7 -03-21 -03-23 -03-28 12.1%
-W13-7 -03-28 -03-30 -04-07 23.5% max
-W14-7 -04-07 -04-07 -04-14 23.2% mid = med
-W15-7 -04-14 -04-14 -04-21 23.3%
-W16-7 -04-21 -04-21 -04-28 17.6%
-W17-7 -04-28 -04-28 -05-07 0.3% min

Source: Symmetry454 documentation

If Easter was permanently moved to the second Sunday after the first Saturday of April, as has been proposed to the WCC, it would either fall onto -W14-7 or -W15-7. The Sunday on or after 5 April would always be -W14-7 and, likewise, the Sunday on or after 12 April would always be -W15-7. 

A new week date of Easter
ISO Sym454 Sym010 13*28 Frequency
-W14-7 -04-07 -04-07 -04-14 39.25%
-W15-7 -04-14 -04-14 -04-21 60.75%

Another, more successful though unimplemented proposal to the WCC for a unified date of Easter is based on astronomic calculation, which makes it mostly impartial on the actual calendar used.

Easter, Pascha and Passover dates by different reckonings
Year Easter/Pascha astronomical Easter/Pascha Gregorian Easter/Pascha Julian Vernal full moon astronomical Passover Jewish
2001 -04-15 W15 -04-08 W14-7
2002 -03-31 W13 -05-05 W18 -03-28 W13-4
2003 -04-20 W16 -04-27 W17 -04-16 W16-3 -04-17 W16-4
2004 -04-11 W15 -04-05 W15-1 -04-06 W15-2
2005 -03-27 W12 -05-01 W17 -03-25 W12-5 -04-24 W16-7
2006 -04-16 W15 -04-23 W16 -04-13 W15-4
2007 -04-08 W14 -04-02 W14-1 -04-03 W14-2
2008 -03-23 W12 -04-27 W17 -03-21 W12-5 -04-20 W16-7
2009 -04-12 W15 -04-19 W16 -04-09 W15-4
2010 -04-04 W13 -03-30 W13-2
2011 -04-24 W16 -04-18 W16-1 -04-19 W16-2
2012 -04-08 W14 -04-15 W15 -04-06 W14-5 -04-07 W14-6
2013 -03-31 W13 -05-05 W18 -03-27 W13-3 -03-26 W13-2
2014 -04-20 W16 -04-15 W16-2
2015 -04-05 W14 -04-12 W15 -04-04 W14-6
2016 -03-27 W12 -05-01 W17 -03-23 W12-3 -04-23 W16-6
2017 -04-16 W15 -04-11 W15-2
2018 -04-01 W13 -04-08 W14 -03-31 W13-6
2019 -03-24 W12 -04-21 W16 -04-28 W17 -03-21 W12-4 -04-20 W16-6
2020 -04-12 W15 -04-19 W16 -04-08 W15-3 -04-09 W15-4
2021 -04-04 W13 -05-02 W17 -03-28 W12-7
2022 -04-17 W15 -04-24 W16 -04-16 W15-6
2023 -04-09 W14 -04-16 W15 -04-06 W14-4
2024 -03-31 W13 -05-05 W18 -03-25 W13-1 -04-23 W17-2
2025 -04-20 W16 -05-20 W21 -04-13 W15-7

See alsoEdit

  1. Mathematics of the ISO 8601 calendar

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