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Diffstat (limited to 'Doc/library/calendar.rst')
| -rw-r--r-- | Doc/library/calendar.rst | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/Doc/library/calendar.rst b/Doc/library/calendar.rst index 8fe93fd..56b75ef 100644 --- a/Doc/library/calendar.rst +++ b/Doc/library/calendar.rst @@ -19,11 +19,13 @@ the week to Sunday (6) or to any other weekday. Parameters that specify dates are given as integers. For related functionality, see also the :mod:`datetime` and :mod:`time` modules. -Most of these functions and classes rely on the :mod:`datetime` module which -uses an idealized calendar, the current Gregorian calendar extended +The functions and classes defined in this module +use an idealized calendar, the current Gregorian calendar extended indefinitely in both directions. This matches the definition of the "proleptic Gregorian" calendar in Dershowitz and Reingold's book "Calendrical Calculations", where -it's the base calendar for all computations. +it's the base calendar for all computations. Zero and negative years are +interpreted as prescribed by the ISO 8601 standard. Year 0 is 1 BC, year -1 is +2 BC, and so on. .. class:: Calendar(firstweekday=0) |