DateKeep

The definitive date and time utility

Days Between Dates

Find the number of days between two dates. Calculate the duration including or excluding weekends and public holidays for accurate planning.

Open tool

Workdays Deadline

Calculate a project deadline by adding workdays to a start date. Automatically skips weekends and lets you exclude public holidays for a true business day calculation.

Open tool

Age Calculator

Calculate your exact age from your date of birth. Find out how old you are in years, months, days, and even minutes with our precise age finder.

Open tool

Time Zone Converter

Easily convert time from one timezone to another. Find the exact time difference between cities worldwide for scheduling meetings and calls.

Open tool

Countdown Timer

Create a live countdown for any event. Set a date and time to see the remaining days, hours, minutes, and seconds tick down in real-time.

Open tool

Time Difference

Calculate the precise duration between two specific points in time. Get the result in a detailed breakdown of days, hours, minutes, and seconds.

Open tool

World Time

View the current local time in major cities around the world at a glance. Perfect for coordinating with international teams and scheduling global meetings.

Open tool

Lunar Calendar

Explore the phases of the moon. See the current moon phase, check upcoming full moons, and see what the moon looked like on any date.

Open tool

Solar Calendar

Visualize the Earth's journey around the sun. Discover the dates of solstices and equinoxes and learn how they mark the changing seasons.

Open tool

Hijri Islamic Calendar

View the Islamic calendar (Hijri) with a month-by-month view. Includes Gregorian dates and an offset for regional moon-sighting.

Open tool

Hebrew Calendar

View the Jewish calendar, navigate by Hebrew months, and see corresponding Gregorian dates. Includes major holiday dates for the year.

Open tool

Weekday Calculator

Find the day of the week for any date. Discover if a past or future date falls on a Monday, Friday, or any other day.

Open tool

Date Incrementer

Generate a sequence of dates from a start date. Perfect for planning recurring events by adding intervals like days, weeks, months, or years.

Open tool

Timestamp Converter

Convert Unix timestamps to human-readable dates and back. A handy tool for developers working with seconds since the epoch (1970-01-01).

Open tool

Date Format Converter

Convert dates between different standard formats, such as MM/DD/YYYY, YYYY-MM-DD, and DD-MMM-YY, including ISO 8601 for technical use.

Open tool

Leap Year Checker

Quickly check if any given year is a leap year. Our tool follows the Gregorian calendar rules to give you an instant and accurate result.

Open tool

Stopwatch & Timer

A simple online stopwatch to measure elapsed time with millisecond precision, and a countdown timer for setting alarms for tasks or breaks.

Open tool

Cultural Calendar Converter

Convert a Gregorian date into Hebrew, Islamic (Hijri), Chinese, Indian, and other cultural calendars. See today's date across different cultures.

Open tool

Julian Date Converter

Convert between the standard Gregorian calendar and the Julian Day Number (JDN) used in astronomy and other scientific fields for unambiguous dating.

Open tool

Holiday Calendar

View holidays for different cultures and countries. Check dates for US Federal holidays, Jewish holidays, and more for the current year.

Open tool

Frequently Asked Questions

All Tools