Date and Time Calculators

Date to Date Calculator

Find out how many days, months, and years there are between any two dates.

Date Calculator

Add or subtract any number of days to/from a start date.

Time Duration Calculator

Find the precise duration between two dates and times — down to the second.

Time Calculator

Add or subtract days, hours, minutes, and seconds to/from a start date and time.

Business Date to Date Calc.

Exclude holidays and weekend days from your date-to-date calculation.

Business Date Calculator

Add or subtract days, excluding holidays and weekend days.


Time & Distance

Time Zone Converter

Find the time difference between two cities.

Distance Calculator

How far is it?

Astronomical Sun & Moon Calculators

Sun Calculator

Sunrise & Sunset

Day length, azimuth, distance etc.

Eclipse Calculator

With 2 speed animation! Local times for Solar and Lunar Eclipses and what it will look like.

Astronomical Seasons Calculator

Equinoxes and solstices mark the beginning of a new astronomical season. Local dates and times.

Moon Calculator

Moonrise & Moonset

Direction, illumination percentage etc.

Moon Phases

New Moon, 1st Quarter, Full Moon, and 3rd Quarter. Local times worldwide.

Day and Night World Map

LIVE Map: Showing the Sun's and Moon's position in the sky with daylight and nighttime.

Week Calculators

Weekday Calculator

Find out the day of the week for a date of your choice.

Or learn to do this calculation in your head.

Week Number Calculator

Calculate the week number for a date or locate any week number on a calendar.

Go to Timers

Various Calculators

Roman Calculator

Convert Arabic numbers into Roman numerals and vice versa.