What’s new in babel 3.76
Although calendars aren’t the primary concern of
babel, the package
should be able to, at least, generate correctly
\today in the way
users would expect in their own culture. Currently,
print dates in a few
ini locale file has been imported), but year, month and
day had to be entered by hand, which is very inconvenient.
babel provided just the Hebrew calendar with
which shows how cumbersome can be the required computations with pure
TeX. Now, thanks to the
l3fp library, they are quite straightforward.
There are converters for 3 calendars:
Hebrew. Basically the set of TeX macros written by Rozman in 1991,
with corrections and adaptations by Porrat, Misha, Haran and Lavva.
This must be eventually replaced by computations with
Islamic. Two calendar are defined:
islamic-umalqura. The code for the former has been taken from
calendar.js by John Walker (public domain). The Umm al-Qura
calendar, used mainly in Saudi Arabia, is based on
moment-hijri (by Abdullah
Alsigar, license MIT). Since the main aim is to provide a suitable
\today, and maybe some close dates, data for
just cover Hijri ~1435/~1460 (Gregorian ~2014/~2038). They can be
- after the name (and
-- in the Civil
calendar), so that, for example, with
islamic-civil+ a day is added.
Persian. There is an algorithm written in TeX by Jabri, Abolhassani, Pournader and Esfahbod, created for the first versions of the FarsiTeX system (no longer available), but the original license is GPL, so its use with LPPL is problematic. The code here follows loosely that by John Walker (see above), which is free and accurate, but sadly very complex, so the relevant data for the years 2013-2050 have been pre-calculated and stored. Actually, all we need is the first day of the Jalali year (either March 20 or March 21).
An example is:
Without the optional argument the current date is used.
Of course new tools will be devised to configure the locales when they
are loaded, to set the default
There are 6 new territory locales for Arabic: Egypt, Iraq, Jordan, Lebanon, Palestinian Territories, and Tunisia. The corresponding tags are
ar-TN, and their names. are
ro-MD, has been added.
There are also some updates and cleanup in English and French.