A3 Calendar

Printable HTML calendar in A3 portrait format, with 3 months per page.

Features

• Local browser generation (no backend)
• Start year + configurable horizon in years (default: 2)
• Two modes:
  • glissant: rolling 3-month pages over the selected horizon
  • trimestre: fixed quarters over the selected horizon
• Subtle visual contrast between side months and the central month on each page
• ISO week numbers
• Sundays and Belgian legal public holidays highlighted
• A3 print / PDF export

Usage

1. Open a3-calendar.html in a browser.
2. Select start year, number of years, and mode.
3. Click Generer calendrier.
4. Click Imprimer / Exporter PDF.

URL Parameters

• year: start year (example: 2026)
• years: number of years to generate (range: 1..20)
• mode: glissant or trimestre

Example: ?year=2026&years=3&mode=glissant

Recommended Print Settings

• Paper size: A3
• Orientation: Portrait
• Scale: 100% (no auto-fit)

Project Structure

• a3-calendar.html: page structure and UI markup
• a3-calendar.css: styles and print layout rules
• a3-calendar.js: calendar generation logic and holiday rules

License

This project is licensed under the MIT License. See LICENSE.