DEDenisDolya·Nov 17, 2025Submission
Show HN: I'm created simple CLI-calendar without time.h
TERMINAL CALENDAR APPLICATION
INTERACTIVE COMMAND-LINE CALENDAR WITH NAVIGATION
KEY FEATURES:
- Monthly calendar display with highlighted current date
- Navigation between months and years
- Return to current date functionality
- Leap year calculation
- Recursive printing functions
- Automatic current date detection
COMPILATION:
gcc -o calendar calendar.c -Wall -O2
USAGE EXAMPLES:
$ ./calendar
Initial display shows current month with today's date highlighted in brackets
NAVIGATION COMMANDS:
n - Next month
p - Previous month
t - Today (return to current date)
q - Quit application
DISPLAY FEATURES:
- Month name and year in header with star borders
- Day names (Su Mo Tu We Th Fr Sa)
- Dates formatted in grid layout
- Current date highlighted as [dd]
- Automatic week wrapping
DATE HIGHLIGHTING:
The current system date is automatically detec
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ted and highlighted
using bracket notation: [15] for the 15th of current month
YEAR HANDLING:
- Automatic leap year calculation for February
- Smooth year transitions when navigating between December and January
- Supports years based on system date capabilities
KEY FUNCTIONS:
leap_year() - Determines if current year is leap year
get_days() - Returns number of days in current month
first_day() - Calculates day of week for 1st of month
print_days() - Recursively prints calendar days with highlighting
GitHub: https://github.com/DenisDolya/cli-arsenal/tree/main/calendar