Calculators & Converters

Date Calculators
Date to Date Calculator

Calculate how many days there are between two dates.

Date Calculator

Add or subtract days, months, or years to or from a specific date.


Business Date to Date Calculator

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

Business Date Calculator

Add or subtract days, excluding holidays and weekend days.

Uses for the date calculators
Time Calculators
Time Duration Calculator

Calculate the precise duration between two points in time.

Time Calculator

Add or subtract seconds, minutes, or hours from a given date.


Time Zone Converter

Calculate the time difference between places and time zones.

Meeting Planner

Find the best time to have a meeting across time zones.

More time zone tools
Week Calculators
Weekday Calculator

What day of the week is this date?

Week Number Calculator

Calculate the week number for a date or find the dates of a week.


Doomsday Calculator

Calculate the weekday of any given date using the doomsday algorithm.

Read about the Doomsday rule
Sun & Moon Calculators
Sunrise and Sunset

Calculate local times for day length, dusk, dawn, and much more.

Moonrise and Moonset

Calculate local times for moonrise, moonset, altitude, and much more.

Moon Phases

Exact times for each Moon phase in your city.

Moon Distance Calculator

Find out how far away the Moon is at key points in its orbit.

More Moon tools
Astronomical Calculators
Eclipses Worldwide

Local times for solar and lunar eclipses and what they look like.

Day and Night World Map

Where is the Sun directly overhead right now?

Seasons Calculator

Exact times and dates for the astronomical seasons in your city.

More astronomy tools
Other Calculators
Special Age Calculator

Find your age in seconds, minutes, hours, days, and weeks.

Date Pattern Calculator

Calculate unique and interesting patterns in different date formats.

Distance Calculator

Calculate the distance between two cities or locations.

Roman Numeral Converter

Convert Arabic numbers into Roman numerals and vice versa.

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