Calculate how many days there are between two dates.

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

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

Add or subtract days, excluding holidays and weekend days.

Calculate the precise duration between two dates with time.

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

Calculate the time difference between places and time zones.

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

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

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

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

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

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

Exact times for each Moon phase in your city.

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

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

Where is the Sun directly overhead right now?

Find the exact time and date for the astronomical seasons.

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

Calculate unique and interesting patterns in different date formats.

Calculate the distance between two cities or locations.

Convert Arabic numbers into Roman numerals and vice versa.