Calendar & Holidays Overview

Time and Date Duration

Calculate the exact duration between two dates and times.

Date Calculator

Add or subtract days, months, and years from any date.

Weekday Calculator

Find which day of the week any date falls on.

Birthday Calculator

Discover your age and when you turn one billion seconds old.

Week Number Calculator

Find the ISO week number for any date.

Calendar Generator

View and print a clean calendar for any year.

The World Clock

See the current time in cities around the world.

Countdown to Any Date

Create a live countdown to a date and time that matters.

Sun & Moon Today

See today's sunlight and lunar phase for a selected city.

Sunrise & Sunset

Calculate sunrise, solar noon, sunset, and daylight.

Moonrise & Moonset

Estimate moonrise and moonset for a place and date.

Moon Phases

Check lunar phase, age, and illumination for any date.

Eclipses

Browse upcoming solar and lunar eclipse highlights.

Night Sky

Find seasonal constellations and the best time to look up.