Fixed Date

Holiday rules based on a fixed Gregorian date, but not necessarily always occurring on the same date. An example is Christmas which is based on December 25th, but which may be moved to the following Monday in many countries, if December 25th falls on a Saturday or Sunday.

Variable Date

Holiday rules based on a given weekday of a given month, such as Labor Day (USA+ Canada) occurring on the first Monday of September.

Easter Based

Holiday rules that are based on a number of days/weeks before or after Easter Sunday (Western or Orthodox). For example, Good Friday would be 2 days before Easter Sunday.

Bhutanese

Holiday rules based on the Bhutanese (lunar and solar) calendars.

Burmese

Holiday rules based on the Burmese (lunar and solar) calendars.

Jewish

Holiday rules based on the Hebrew calendar.

Muslim

Holiday rules based on the Muslim Hijra calendar.

Chinese

Holiday rules based on the Chinese (lunar and solar) calendars.

Korean

Holiday rules based on the Korean (lunar and solar) calendars.

Vietnamese

Holiday rules based on the Vietnamese (lunar and solar) calendars.

Mongolian

Holiday rules based on either the Mongolian lunar calendar or the Mongolian solar calendar.

South-East Asian

Holiday rules based on one of the variants of the traditional south-east Asian calendar system.

Tibetan

Holiday rules based on either the Tibetan lunar calendar or the Tibetan solar calendar.

Persian

Holiday rules based on the Persian calendar.

Zoroastrian

Holiday rules based on the 3 variants of the Zoroastrian calendar, most importantly, the Parsi calendar used in India.

Sikh

Holiday rules based on the Nanakshahi calendar.

Coptic

Holiday rules based on the Coptic calendar (also covers Egyptian, Ethiopic and Armenian).

Hindu

Holiday rules based on the Hindu (lunar and solar) calendars.

Arbitrary Dates

Holidays whose rule is too complicated or cannot be predicted (for example election day in the UK).

Range of Dates

Events that have a start and end date. Typically, this type of holiday refers to an event (trade fair, Olympics, company event, convention, ...) rather than to a holiday per se.

Solar

Holidays based on solar events such as the 4 seasons, the 2 equinoxes, the 2 solstices and the entry of the Sun into each of the 12 Zodiac signs.

Lunisolar

These are either holidays based on lunar events that occur after a given solar event has occurred. This is used for many lunisolar calendars of southeast Asia, where holidays fall on the Nth full moon after the beginning of the solar year (as they themselves define it). These are usually yearly events. Or they are holidays based on repeating lunar events, such as Ponga days in India and Sri Lanka. Then these can be monthly events.