WhatIsTheDay

What Day Is It Today?

Free weekday calculator — find the day of the week for any date instantly.

📅 10+ calendar systems🏛️ BC/AD support🌍 50+ countries⚡ Instant results

Whatistheday/Leap Year Checker

Leap Year Checker

Instantly check whether any year is a leap year in the Gregorian and Hebrew calendars.

Enter a year

Gregorian

NO

2026 is NOT a leap year

2026 is not divisible by 4 — not a leap year.

Hebrew

YES

5787 is a leap year

Hebrew year 5787 has an extra month (Adar II) (19-year Metonic cycle).

Leap years in the current decade

2020

Leap

2021

Common

2022

Common

2023

Common

2024

Leap

2025

Common

2026

Common

2027

Common

2028

Leap

2029

Common

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Whatistheday – Day of the Week Calculator

Whatistheday is a free weekday calculator and multi-calendar date converter. Find the exact day of the week for any date — past, present, or future — with 100% mathematical accuracy.

Features

Weekday Calculator: Instantly determine what day of the week any date falls on, from 4000 BC to thousands of years in the future.
10+ Calendar Systems: Convert dates across Gregorian, Hebrew, Islamic (Hijri), Julian, Chinese Lunar, Hindu (Vikram Samvat), Maya (Long Count), Egyptian, and Babylonian calendars.
BC/BCE Support: Full support for ancient and historical dates using the Proleptic Gregorian and Julian calendar systems with astronomical year numbering.
Date Calculators: Business days calculator, age calculator, date difference, day of year, ISO week number, and leap year checker.
50+ Country Holidays: View public holidays and countdowns for over 50 countries worldwide.

Accuracy

Our engine uses the Proleptic Gregorian Calendar for modern and future dates and the Julian Calendar for dates before the Gregorian Reform of 1582. This dual-system approach ensures historically accurate weekday results for any era, making it ideal for academic research, genealogy, and religious calendar synchronization.

Whatistheday is completely free, requires no registration, and works on any device. All calculations are performed locally in your browser for instant results and total privacy.