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: 0.2 2026-09-21
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_yearis a long year (53 weeks).Parameters:
- i_year number ISO year.
Returns:
-
boolean