Specification for `holidays.yaml`

Version: 2.2.0

This document describes the data contained within the files holidays.yaml and names.yaml.

structure of names.yaml
structure of holidays.yaml
Citations, Sources, and Attribution
- Source Guidelines
Types of holidays
Grammar for day rules
Generation of holidays.json

structure of `names.yaml`

names.yaml contains translations of commonly used rules or days. These are referenced using the _name: key from within holidays.yaml.

The basic structure looks as follows:

names:
  <identifier>:
    <lang_1>: {String} # name in language 1
    <lang_2>: {String} # name in language 2

The <identifier> can be referenced using _name:.
<lang_?> represents the ISO 639-1 language code for the assigned language.

structure of `holidays.yaml`

holidays.yaml contains the holiday data for all supported countries, states, regions

The basic structure look as follows:

version: <versionNumber>

holidays:
  <country_code_1>:     # IANA country code
    names:              # name of country
    dayoff: {String}    # name of weekday which is a default day off (Friday|Saturday|Sunday|...)
    days:               # see days structure
      ...
    states:             # (optional) specify special holidays per state
      <state_code_1>:   # short code of state (ISO 3166-2)
        names:          # name of state
        days:           # see days structure
          ...
        regions:        # (optional) specify special holidays per region
          <region_code_1>:  # short code of region (ISO 3166-2 if applicable)
            names:      # name of region in local language
            days:       # see days structure
              ...
    regions:            # (optional) specify special holidays per region (for small countries without states)
      <region_code_1>:  # short code of region
        names:          # name of region
        days:           # see days structure
          ...
  <country_code_2>:     # next country ...
    ...

<country_code_?> is the IANA code of the country
<state_code_?> is a short code representing the state (any ascii based string)
<region_code_?> is a short code representing the region (any ascii based string)

For country codes check:

https://en.m.wikipedia.org/wiki/List_of_Internet_top-level_domains#Country_code_top-level_domains

For country codes / divisions / subdivisions - ISO 3166-2:
http://www.unicode.org/cldr/charts/30/supplemental/territory_subdivisions.html

For timezones:
https://github.com/moment/moment-timezone/blob/develop/data/meta/latest.json

For language codes ISO 639-1:
http://www.unicode.org/cldr/charts/30/supplemental/language_territory_information.html

To specify the rules to calculate the holidays per country, state, region is as follows:

<country/state/region>:
  names:                   # name of country/state/region
    <lang_1>: {String}     # name in local language
    <lang_2>: {String}     # name in other language
  name: {String}           # name of country/state/region in local language of country (use only if `names` not present)
  langs:                   # (mandatory for country) list of language codes (ISO 639-1)
    - <lang_1>             # spoken in country, state, region
    - <lang_2>
  zones:                   # (mandatory for country) list of timezone(s)
    - <timezone_1>
    - <timezone_2>
  _days:                   # (optional) reference days of other country, state, region
    - <country_code_x>
    - states
    - <state_code_x>
    - regions
    - <regions_code_x>
  days:
    <rule_1>:              # see grammar
      name:
        <lang_1>: {String} # name of day in language 1
        <lang_2>: {String} # name of day in language 2
      type: {String}       # type of holiday (public|bank|school|optional|observance)
      note: {String}       # (optional) note
      substitute: true     # (optional) if set to true then '(substitute day)' gets appended to name
      disable:             # (optional) disables a date
        - '<YYYY-MM-DD>'   # list of date stings in quotes declaring the dates to disable the rule
      enable:              # (optional) enables the days, such moving it to the given date. Only use with `disable`
        - '<YYYY-MM-DD>'   # list of date stings in quotes declaring the dates to enable the disabled rule
    <rule_2>:
      _name: <ref>    # reference of name translated within `names.yaml` file

<county/state/region> is the shortcode to identify country, state or region
<lang_?> represents the ISO 639-1 language code for the assigned language.
<timezone_?> is a string representing the timezone. See file data/meta/latest.json of moment-timezone
<rule_?> is the rule for that holiday

Citations, Sources, and Attribution

Be sure to cite the URL where you obtained the holiday information. This project has support for two types of sources: primary and secondary/Wikipedia. To cite a primary source, add a YAML comment near corresponding specification. For example, from US.yaml:

# @source https://www.federalreserve.gov/aboutthefed/k8.htm
substitutes 11-11 if sunday then next monday if saturday then previous friday:
  substitute: true
  name:
    en: Veterans Day
  type: bank
  note: Federal Government offices are closed

For Wikipedia sources, it is important to use @attrib instead of @source. The doc:attrib NPM task consolidates these attributions into the LICENSE file to comply with Wikipedia's Creative Commons ShareAlike licencing. Here is an example of using @attrib:

# @attrib https://en.wikipedia.org/wiki/Public_holidays_in_Bahrain
holidays:
  BH:
    names:
      ar: مملكة البحرين
      en: Bahrain

Source Guidelines

Primary sources are preferable to secondary sources. Examples of good primary sources include but are not limited to government legislation, news articles, and national bank publications. Please refrain from including sources from data aggregators and websites which offer holiday data as often times the licencing is too restrictive or unclear for use in an open source project.

Types of holidays

Currently the following type with their meaning are supported

type	meaning
public	public holiday
bank	bank holiday, banks and offices are closed
school	school holiday, schools are closed
optional	majority of people take a day off
observance	optional festivity, no paid day off

Additionally a note field is sometimes available for further clarification.

Grammar for day rules

Fixed Date

A fixed day in a year is attributed with MM-DD in ISO notation.

A fix day for a given year is attributed with YYYY-MM-DD.

Examples:

01-01 is January first
12-11 is December 11th
'2015-10-09' is October 9th of 2015 (Enclose such date in quotes as otherwise it will be expanded to an ISO date by yaml parser)

Fixed Date at beginning of a Month

Examples

February equals to 02-01

Movable Date

Easter Dates

Easter and Orthodox Easter (using Julian Calendar) are supported as movable dates.

Rule: (easter|orthodox) (+|-)?<number-of-days>

Examples:

easter is Easter Sunday
easter -2 is 2 days before Easter Sunday (Good Friday)
easter 49 is 49 days after Easter Sunday (Pentecost)
orthodox is Easter Sunday using the Julian Calendar
orthodox -2 is 2 days before Easter Sunday (Good Friday) using the Julian calendar
orthodox 49 is 49 days after Easter Sunday (Pentecost) using the Julian calendar

Hijra Dates

Note: Islamic days start at sunset which depends on latitude/ longitude. To avoid such calculations, the approximation of using 18:00 as hour of sunset is made.

Dates in the islamic calendar can be attributed using the following rule:

Examples:

3 Shawwal is 3rd day in month Shawwal

Dates in Hebrew calendar

Note: Days in the Hebrew calendar start at sunset which depends on latitude/ longitude. To avoid such calculations, the approximation of using 18:00 as hour of sunset is made.

Dates in the islamic calendar can be attributed using the following rule:

Where:

<day-of-month> [1..28]

Examples:

15 Nisan is 15th day in month Nisan

Dates in Chinese calendar (lunar)

Dates in the chines calendar can be attributed using the following rule:

Rule: chinese <cycle>-<year>-<month>-<leapmonth>-<day>

Where:

<cycle> (optional) Chinese cycle - current is 78
<year> (optional) year in Chinese cycle (1 ... 60)
<month> (mandatory) lunar month
<leapmonth> (mandatory) 0|1 - 1 means month is leap month
<day> (mandatory) day of lunar month

Examples:

chinese 01-0-01 is 1st day in the 1st lunar month (aka Chinese New Year)
chinese 78-32-08-0-15 is 15th day in the 8th non-leap lunar month in year 32 of 78th cycle

Dates in Chinese calendar (solar)

Rule: chinese <cycle>-<year>-<count>-<day> solarterm

Where:

<cycle> (optional) Chinese cycle - current is 78
<year> (optional) year in Chinese cycle (1 ... 60)
<count> (mandatory) Number of solar term. (1 .. 24)
<day> (mandatory) day of lunar month

Examples:

chinese 5-01 solarterm is the 1st day in the 5th solarterm (aka Qingming Festival)
chinese 78-32-24-01 solarterm is the 1st day in the 24th solarterm in year 32 of 78th cycle

Dates in Bengali Revised calendar

Rule: bengali-revised <year>-<month>-<day>

Where:

<year> (optional) year
<month> (mandatory) month (1..12)
<day> (mandatory) day of month (1..31)

Examples:

bengali-revised 12-1 is the 1st day in the 12th month
bengali-revised 1425-1-1 is the 1st day in the first month of 1425 - equals 2018-04-14 in Gregorian date

Dates in Persian calendar

Dates in the persian calendar can be attributed using the following rule:

Where:

<day-of-month> [1..30]
<year> optional year

Examples:

1 Farvardin is 1st day in month Farvardin

Equinox, Solstice

To calculate a date from Spring, Autumn Equinox or Summer, Winter Solstice the following rule can be used:

Rule: (<number-of-days>|<count>? <weekday>) (after|before) (March|September) equinox (in <timezone>)?

Rule: (<number-of-days> (d|days)?|<count>? <weekday>) (after|before) (June|December) solstice (in <timezone>)?

Where:

<number-of-days> e.g. 5 days
<count> 1st, 2nd, 3rd, 4th ... 100th
<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

If in <timezone> is missing then GMT is assumed.

Examples:

december solstice is December solstice in timezone GMT
5 days before september equinox is 5 days before September equinox using GMT timezone
march equinox in Asia/Tokyo is march equinox in the timezone "Asia/Tokyo"
march equinox in +09:00 is march equinox in the timezone "+09:00"
3rd Sunday after june solstice in Asia/Tokyo is 3rd Sunday after June solstice in the timezone "Asia/Tokyo"

Different start-time for Fixed Date other than midnight

A holiday might start in the afternoon of a given day HH:MM

Rule: append HH:MM

Examples:

12-31 14:00 holiday starts at 14h on December 31st

Different duration other than 24 hours

A holiday last longer/less then the default of one day. For attribution the ISO 8601 format for durations is used.

Rule: append P0DT0H0M

where 0 gets replaced by a number
D = days
H = hours
M = minutes
years, months and seconds are not supported

Examples:

12-31 14:00 PT5H holiday starts at 14h on December 31st and ends at 21h as duration is 5 hours
easter P1DT12H holiday starts on midnight Easter Sunday and ends at the following Tuesday at 12h

Start-time of holiday changes per weekday

A holiday might start in the afternoon of a given day HH:MM but on a different time for another weekday.

Rule: MM-DD HH:MM if <weekday> then HH:MM

Where:

<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Examples:

12-31 14:00 if Sunday then 00:00 holiday starts at 14h on December 31st but if December 31st falls on a Sunday start date will be 00:00

Changes to different weekday from a given fixed Date

A holiday may change to a weekday starting from a given fixed Date.

Rule: <count> <weekday> (after|before) MM-DD

Where:

<count> 1st, 2nd, 3rd, 4th ... 100th
<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

"after" means the same day and after

"before" means all days before but not the same day

Examples:

Monday after 02-01 is the Monday after February 1st or February 1st if this day is a Monday
Monday before 02-01 is the Monday before February 1st but can never be February 1st
2nd Sunday after 05-01 is the 2nd Sunday in May
4th Thursday after 11-01 is the 4th Thursday in November
Sunday before 10-01 is the last Sunday in September

Changes to different weekday from a given Month

A holiday may change to a weekday starting from the first day of a month.

Rule: <count> <weekday> (before|in) <month>

Where:

<count> 1st, 2nd, 3rd, 4th ... 100th
<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

"in" means the same day and after

"before" means all days before but not the same day

Examples:

1st Monday in February is the Monday after February 1st or February 1st if this day is a Monday
Monday before February is the Monday before February 1st but can never be February 1st
2nd Sunday in May is the 2nd Sunday in May
4th Thursday in November is the 4th Thursday in November
Sunday before October is the last Sunday in September

Change to a different weekday from a changed fixed Date

Rule: <weekday> (after|before) <count> <weekday> (after|before) MM-DD

Where:

<count> 1st, 2nd, 3rd, 4th ... 100th
<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Examples:

Friday after 4th Thursday after 11-01 is the Friday after the 4th Thursday in November
Saturday before 2nd Sunday after 05-01 is the Saturday before the 2nd Sunday in May

Change to different weekday if date falls on a certain weekday

Rule: MM-DD if <weekday> then (next|previous) <weekday>

Where:

<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Holiday is moved if the rule matches, otherwise it stays on the date given.

Examples:

03-02 if Sunday then next Monday if March 2nd is on a Sunday then holiday will be on next Monday, otherwise it is March 2nd
04-13 if Friday then previous Monday if April 13th is on a Friday then holiday falls to previous Monday, on all other weekdays it is observed on April 13th.

Substitute a holiday if date falls on a certain weekday

Rule: substitutes MM-DD if <weekday> then (next|previous) <weekday>

Where:

<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

If substitute: true is given then the translated string from names.yaml/names/substitutes will be appended to the name. E.g. "Christmas" becomes "Christmas (substitute day)"

Holiday is active if the rule matches for the moved date.

Examples:

substitutes 03-02 if Sunday then next Monday if March 2nd is on a Sunday then holiday will be on next Monday, for all other weekdays no holiday is observed.
substitutes 04-13 if Friday then previous Monday if Apri 13th is on a Friday then holiday falls to previous Monday

Observe the holiday as well as on a substitute day, if date falls on a certain weekday

Rule: MM-DD and if <weekday> then (next|previous) <weekday>

Where:

<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

This line generates two holidays. One for MM-DD plus the observed substitute day following the rule.

If substitute: true is given then the translated string from names.yaml/names/substitutes will be appended to the name. E.g. "Christmas" becomes "Christmas (substitute day)"

Examples:

03-02 and if Sunday then next Monday if March 2nd is on a Sunday then and additional holiday will be observed on next Monday as well.
04-13 and if Friday then previous Monday if April 13th is on a Friday then and additional holiday falls to previous Monday

Enable Date only for odd/ even numbered years

Rule: MM-DD in (even|odd|leap|non-leap) years

Examples:

03-02 in even years if year is even numbered (e.g. 2012) then March 2nd will be a holiday
04-03 in odd years if year is odd numbered (e.g. 2011) then April 3rd will be a holiday
05-04 in leap years if year is a leap year (e.g. 2012) then May 4th will be a holiday
06-05 in non-leap years if year is not a leap year (e.g. 2011) then June 5th will be a holiday

Enable Date only for certain periods of years

Rule: MM-DD every <count> years since <year>

Examples:

12-01 every 6 years since 1980 if year is within a 6 years period from 1980 on December 1st will be a holiday (e.g. for 1986, 1992, 1998, ...)

Enable Date only for certain weekdays

Rule: MM-DD (not) on <weekday>

Where:

<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Examples:

02-01 on Monday, Tuesday February, 1st is a holiday only if weekday is a Monday or Tuesday
12-26 not on Friday, Monday December, 26nd is a holiday only if weekday is not Monday or Friday

Holiday based on other holidays (bridge days)

Rule: <date> if MM-DD (and MM-DD)? is (<type>)? holiday

Where:

<date> MM-DD(-YYYY)?
<type> public

Examples:

09-22 if 09-21 is holiday is September 22nd is public holiday only if September 21st is also a holiday
09-22 if 09-21 and 09-23 is public holiday is September 22nd is public holiday only if September 21st and September 23rd are public holidays

Change to different weekday if date already falls on a holiday

Rule: <rule> if is (<type>)? holiday then (<count>)? (next|previous) <weekday>

Rule: <rule> if is (<type>)? holiday then (<count>)? (next|previous) day (omit <weekdays>)?

Where:

<rule> any rule
<type> public, bank, school, observance, optional (defaults to public if omitted)
<count> 1...31, 1st, 2nd, 3rd
<weekday> Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
<weekdays> Comma separated list of <weekday>

Examples:

Thursday after 04-02 if is observance holiday then next Thursday
03-01 and if Saturday, Sunday then next Monday if is holiday then 2nd next Tuesday since 2022
05-01 if is public holiday then 2nd next day omit Saturday, Sunday

Enabling a rule since or in certain years

Note: Use quotes around dates!

days:
  # rule is active since 2004
  08-25:
    active:
      - from: '2004-01-01'
  ...
  # rule is active in years 1990...1999, 2004...2005-08, 2016...
  08-24:
    active:
      - from: '1990-01-01'
        to: '1999-07-01'
      - from: '2004-01-01'
        to: '2005-08-03'
      - from: '2016-01-01'

Disabling a rule

On any rule it is possible to disable it for a given date. For every year an entry can be applied to the list.

E.g. in case that the 4th Monday in November is the 2015-11-23 then the day will not be a holiday.

Note: Use quotes around date!

days:
  4th Monday after 11-01:
    disable:
      - '2015-11-23'
    name:
      en: Day of National Sovereignty

Moving a date

In order to move a date for a rule use disable together with enable.

E.g. in case that the 4th Monday in November is the 2015-11-23 then the day gets moved to 2015-11-27.

Note: Use quotes around dates!

days:
  4th Monday in November:
    disable:
      - '2015-11-23'
    enable:
      - '2015-11-27'
    name:
      en: Day of National Sovereignty

Disabling a rule in states/ regions

Sometimes it is necessary to disable a general rule for a single state or region.

holidays:
  OZ:
    name:
      en: Land of Oz
    ...
    days:
      04-01:
        name:
          en: 1st of April
    regions:
      IX:
        name: Kingdom of IX
        days:
          04-01: false # disables rule

Renaming or discontinuing holidays

Rule: <rule> prior to YYYY(-MM-DD)?

Rule: <rule> since YYYY(-MM-DD)?

Rule: <rule> since YYYY(-MM-DD)? and prior to YYYY(-MM-DD)?

Where:

<rule> is a valid holiday rule

Examples:

In this example Fool's Day was renamed to 1st of April in year 1900.

days:
  04-01:
    name:
      en: Fool's Day

becomes

days:
  04-01 prior to 1900:
    name:
      en: Fool's Day
  04-01 since 1900:
    name:
      en: 1st of April

In case that 1st of April was discontinued as holiday in 1920:

days:
  04-01 prior to 1900:
    name:
      en: Fool's Day
  04-01 since 1900 and prior to 1920:
    name:
      en: 1st of April

Other option:

In cases where holiday names get replaced the same rule may be required more than once. Here add #<0-9> to that rule and enclose it in quotes.

In this example Fool's Day was renamed to 1st of April in year 1900.

days:
  04-01:
    name:
      en: 1st of April
    active:
      - from: 1900-01-01
  '04-01 #1':
    name:
      en: Fool's Day
    active:
      - to: 1900-01-01

Generation of `holidays.json`

To generate the file holidays.json which is used by the module run:

npm run yaml

This concatenates the two files holidays.yaml and names.yaml and generates the JSON file.

References

moment-timezone

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Specification for holidays.yaml

Table of Contents

structure of names.yaml

structure of holidays.yaml

Citations, Sources, and Attribution

Source Guidelines

Types of holidays

Grammar for day rules

Fixed Date

Fixed Date at beginning of a Month

Movable Date

Easter Dates

Hijra Dates

Dates in Hebrew calendar

Dates in Chinese calendar (lunar)

Dates in Chinese calendar (solar)

Dates in Bengali Revised calendar

Dates in Persian calendar

Equinox, Solstice

Different start-time for Fixed Date other than midnight

Different duration other than 24 hours

Start-time of holiday changes per weekday

Changes to different weekday from a given fixed Date

Changes to different weekday from a given Month

Change to a different weekday from a changed fixed Date

Change to different weekday if date falls on a certain weekday

Substitute a holiday if date falls on a certain weekday

Observe the holiday as well as on a substitute day, if date falls on a certain weekday

Enable Date only for odd/ even numbered years

Enable Date only for certain periods of years

Enable Date only for certain weekdays

Holiday based on other holidays (bridge days)

Change to different weekday if date already falls on a holiday

Enabling a rule since or in certain years

Disabling a rule

Moving a date

Disabling a rule in states/ regions

Renaming or discontinuing holidays

Generation of holidays.json

References

Specification for `holidays.yaml`

structure of `names.yaml`

structure of `holidays.yaml`

Generation of `holidays.json`