Gcal 3.01

Gcal is a program for calculating and printing calendars. It displays hybrid and proleptic Julian and Gregorian calendar sheets, respectively for one month, three months, or a whole year.
It also displays eternal holiday lists for many countries around the globe, and features a very powerful creation of fixed date liststhat can be used for reminding purposes. Gcal can calculate various astronomical data and times of the Sun and the Moon for pleasure at any location, precisely enough for most civil purposes.
Gcal supports some other calendar systems, for example, the Chinese and Japanese calendars, the Hebrew calendar, and the civil Islamic calendar, too.
English user manual included; German user manual included.
Main features:
- Some special calendar sheet formats.
- Calendar sheets can be provided with week numbers.
- Variable number of year calendar sheet blocks.
- Adjustable ordering of displayed dates.
- Adjustable period of Gregorian Reformation.
- Proleptic Julian and Gregorian calendars.
- Adjustable highlighting of holidays and actual day.
- Variable starting day of week.
- Output of day-of-year numbers and concatenated day and day-of-year numbers.
- Allows user-defined ordering of the date elements.
- Output of fiscal years.
- Output of lists or ranges of months or years.
- Sorted output of selectable country/territory specific eternal holiday lists (mostly complete) for nearly *all* countries around the globe, which are generated automatically.
- Sorted output of Christian Western churches calendar holidays, Orthodox Christian Eastern churches old and new calendar holidays, Hebrew calendar holidays, Islamic civil calendar holidays (since AD 622), Persian "Jalaali" calendar holidays, Chinese and Japanese calendar holidays (since AD 1645), more "other" calendar system holidays, multicultural New Years Days, and start of "other" calendar system months, which are also generated automatically.
- Sorted output of fixed date lists which can be defined and created in a highly flexible manner.
- Allows filtration of fixed dates by using regular expressions and other built-in methods.
- Allows the use of date and text variables and basic operations on them.
- Some gimmicks like solar and lunar eclipse time, sunrise/sunset plus a lot of other Sun based data and times, Moon phase, Full and New Moon time, moonrise/moonset plus a lot of other Moon based data and times, zodiacal markers, equinox and solstice, air line distance between two geographic point locations plus course angles, biorhythm et cetera...
- Fixed dates can be stored in several files.
- Nearly unlimited nesting level of include files.
- Nearly unlimited internal text and table lengths.
- Default options can be stored in the `GCAL environment variable.
- Options and commands stored in response files can be preloaded.
- Uses either an external pager or a simple built-in pager.
- Detailed Texinfo reference manual.
- German, English and American program version by default.
- Supports various computer platforms.
- GNU `gettext internationalization technology, which allows the use of message catalogs for most native languages.
- GNU `autoconf(iguration) installation technology.
- Supports both UN*X short-style options and GNU long-style options.