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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 out the precise duration between two dates and times of day — 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.

Week Calculators

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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

Astronomical Calculators

Sun Calculator

Sunrise & Sunset

Includes location-specific day lengths, azimuth (direction), distance, and more.

Eclipse Calculator

Find out when the next eclipse occurs and if you can see it.

Seasons Calculator

Find the time & date of equinoxes and solstices.

Moon Calculator

Moonrise & Moonset

Also shows the direction for moonrise/moonset, the percentage of
illumination, and more.

Moon Phases

Precise world-wide times of New Moon, 1st Quarter, Full Moon, and 3rd Quarter phases.

Day and Night World Map

See where there is daylight or night time.

Time & Distance

Time Zone Converter

Find the time difference between two cities.

Distance Calculator

How far is it?

Travel Time Calculator

Time zone conversions for your flight.

International Dialing Codes

Which country & area codes do I have to dial?