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
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.
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.