cal

Display a calendar.

Implemented

• Single month display (default)
• Three-month display (-3)
• Year display (-y)
• Next twelve months (-Y)
• N-month display (-n)
• Monday (-m) or Sunday (-s) as first day of week
• Julian/ordinal day numbering (-j)
• Configurable number of columns (-c)
• Positional arguments: [[[day] month] year]
• Month names and abbreviations as arguments (e.g., cal March)
• Special date words: today, tomorrow, yesterday

Not yet implemented

• --vertical (ncal-style vertical layout)
• --reform (Julian/Gregorian calendar reform date handling)
• --week (ISO/US week number display)
• --color (terminal colorization of today, weekends, headers)
• --span (center multi-month display on the target date)
• Locale-aware month/day names (currently English only)
• Relative date expressions (+2days, 1 week ago)