YAML Data Format

The YAML data format (YAML Ain’t Markup Language) is a human-friendly universal data serialization format. See http://yaml.org for a complete description.

  • Fields are not quoted, and empty fields are represented by the omission of values.
  • All data is provided in UTF-8.


  %YAML 1.1
      locale: en-US
      date: 2012-01-01
      description: New Year's Day
      type: NF


  • locale is a combination of an ISO 639-1 language code, such as en (English), and an ISO 3166-1 alpha-2 country code, such as US (United States), separated by a hyphen: e.g. en-US.

  • region is a subdivision of locale, for those locales that have regional holidays. Regions are represented by their respective ISO 3166-2 Country subdivision code. For example, Patriot’s Day is only observed in the en-US locale in Massachusetts (MA) and Maine (ME), so there are entries for each of those states.

  • date is provided in YYYY-MM-DD format.

  • description is text that simply describes the holiday.

  • type is a collection of single-character indicators, that describe the holiday:

    • N means national holiday, which means locale-wide.
    • R means it is a religious holiday.
    • F means the holiday date is fixed, i.e. on the same day each year.
    • V means the holiday date is variable, e.g. tied to a Monday, or the third Thursday of a month.
  • notes are provided in some cases for clarification, but are not to be used as part of the holiday description.