📅 Date Calculator · Days Between & Date Math ⚖️✨

🌍 Find years, months, weeks, days between dates · Add/Subtract with holidays 🌙

📆 Days Between Dates

Start Date

End Date

— — —

years · months · weeks · days

➕ Add / Subtract from Date

Base Date

Value

Unit

Days Weeks Months Years

Operation

➕ Add ➖ Subtract

📅 — — —

Result date (considering holidays nearby info)

⚙️ Settings · Define Holidays

📌 No holidays yet. Add global holidays (affects calculations & display)

Holidays are used to highlight extra info & in “Add/Sub” the result will show if falls on holiday. Between dates also counts total days & mentions any holiday overlap (optional).

📖 How to Use · Examples

Show quick guide & examples

📌 Days Between: Pick Start Date and End Date → click "Calculate Difference" → get years, months, weeks, days breakdown. Also total days & mentions if any holiday in range (if holidays added).

➕ Add/Subtract: Choose a base date, value, unit (days, weeks, months, years), operation (add/subtract). Click compute → new date appears. It also indicates if the result date is a defined holiday.

🎉 Holidays: Under settings, you can define any global holidays. They are stored locally in your browser. Useful for checking if target date is holiday.

✨ Example: Between Jan 1, 2024 and Mar 28, 2025 → result ~ 1 year, 2 months, 27 days (approx). Add 3 weeks to Mar 28, 2025 → Apr 18, 2025. Define holiday "Apr 18, 2025: Spring Fest" and see warning.

Works for all major countries: uses Gregorian calendar (ISO 8601).

Years/Months/weeks/days – based on actual calendar months (not fixed 30d).

Holidays affect visibility – both modes show holiday info.

📜 History of the Gregorian Calendar 🌍 Holidays Around the World

All calculations are precise using UTC & calendar logic. Holidays stored locally.