lua-calendrica

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Contents

• Functions

Modules

• calendrica
• calendrica-akan
• calendrica-astro
• calendrica-astronomical-lunar
• calendrica-bahai
• calendrica-balinese
• calendrica-basic
• calendrica-chinese
• calendrica-coptic-ethiopic
• calendrica-ecclesiastical
• calendrica-egyptian-armenian
• calendrica-french-revolutionary
• calendrica-gregorian
• calendrica-hebrew
• calendrica-icelandic
• calendrica-islamic
• calendrica-iso
• calendrica-julian
• calendrica-mayan
• calendrica-modern-civil
• calendrica-modern-hindu
• calendrica-old-hindu
• calendrica-persian
• calendrica-tibetan

Topics

• manual
• calendars
• holidays

Module calendrica-french-revolutionary

French Revolutionary calendar conversions (astronomical and arithmetic).

Ported from “Calendrical Calculations” (4th edition) by Nachum Dershowitz and Edward M. Reingold. Original Lisp code (CALENDRICA 4.0) is Apache 2.0 licensed.

Info:

• Release: 0.2 2026-09-21

Functions

fixed_from_french (f_date)	Fixed date of astronomical French Revolutionary date f_date.
french_from_fixed (date)	Astronomical French Revolutionary date {year, month, day} for fixed date.
french_leap_year (f_year)	True if f_year is an astronomical French Revolutionary leap year.
arithmetic_french_leap_year (f_year)	True if f_year is an arithmetic French Revolutionary leap year.
fixed_from_arithmetic_french (f_date)	Fixed date of Arithmetic French Revolutionary date f_date.
arithmetic_french_from_fixed (date)	Arithmetic French Revolutionary date {year, month, day} of fixed date.

Functions

fixed_from_french (f_date)

Fixed date of astronomical French Revolutionary date f_date.

Parameters:

• f_date table French date {year, month, day}.

Returns:

number Fixed date.

french_from_fixed (date)

Astronomical French Revolutionary date {year, month, day} for fixed date. Uses round_half_to_even to match Lisp’s round.

Parameters:

• date number Fixed date.

Returns:

table {year, month, day}

french_leap_year (f_year)

True if f_year is an astronomical French Revolutionary leap year.

Parameters:

• f_year number French Revolutionary year.

Returns:

boolean

arithmetic_french_leap_year (f_year)

True if f_year is an arithmetic French Revolutionary leap year.

Parameters:

• f_year number French Revolutionary year.

Returns:

boolean

fixed_from_arithmetic_french (f_date)

Fixed date of Arithmetic French Revolutionary date f_date.

Parameters:

• f_date table Arithmetic French date {year, month, day}.

Returns:

number Fixed date.

arithmetic_french_from_fixed (date)

Arithmetic French Revolutionary date {year, month, day} of fixed date.

Parameters:

• date number Fixed date.

Returns:

table {year, month, day}