Module calendrica-iso
ISO week-date calendar conversions.
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: 0.1 2026-07-19
Functions
| fixed_from_iso (i_date) | Fixed date equivalent to ISO date `i_date`. |
| iso_from_fixed (date) | ISO date {year, week, day} corresponding to fixed `date`. |
| iso_long_year (i_year) | True if ISO year `i_year` is a long year (53 weeks). |
Functions
- fixed_from_iso (i_date)
-
Fixed date equivalent to ISO date `i_date`.
Parameters:
- i_date table ISO date {year, week, day}.
Returns:
-
number
Fixed date.
- iso_from_fixed (date)
-
ISO date {year, week, day} corresponding to fixed `date`.
Parameters:
- date number Fixed date.
Returns:
-
table
{year, week, day}
- iso_long_year (i_year)
-
True if ISO year `i_year` is a long year (53 weeks).
Parameters:
- i_year number ISO year.
Returns:
-
boolean