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Leap Year Calculator

World's Simplest Time Tool

With this browser-based application, you can find all leap years (years that have 366 days) within a certain range of years. You can specify the start year and the end year of the range in the options and the program will display all leap years in this interval. You can also customize the format of the output by specifying the separator character that goes between the printed leap years. Created by computer nerds from team Browserling.

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Leap Year Calculator

World's Simplest Time Tool

With this browser-based application, you can find all leap years (years that have 366 days) within a certain range of years. You can specify the start year and the end year of the range in the options and the program will display all leap years in this interval. You can also customize the format of the output by specifying the separator character that goes between the printed leap years. Created by computer nerds from team Browserling.

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See Examples
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Tool Options

Leap Year Search Range

Enter the start range year.
Enter the end range year.

Leap Year Separator

Enter a character to separate the printed leap years.

What Is a Leap Year Calculator?

This is a quick online utility for calculating leap years that fall within the specified period of time. Just to remind you, a leap year consists of 366 days, which is 1 day longer than the common year of the Gregorian calendar, which consists of 365 days. The reason why leap years are used is that it actually takes 365.2425 days for the Earth to complete one revolution around the Sun. Every 4 years the fractional part of 0.2425 adds up to an extra day, which is then added to the calendar on February 29th. Thus, leap years are those that are evenly divisible by 4, for example, 2020, 2024, 2028, 2032, …. However, there is still an additional smaller error in the fractional part, which is the 0.0025 part. Therefore, to account for this extra small deviation, it's defined that a year that is divisible by 100 is a leap only if it is also divisible by 400. Using this algorithm, the program calculates and prints all leap years in the interval of years that you specify in the options. You can also customize the format of the output list by entering a character to separate leap years. Timeabulous!

What Is a Leap Year Calculator?

This is a quick online utility for calculating leap years that fall within the specified period of time. Just to remind you, a leap year consists of 366 days, which is 1 day longer than the common year of the Gregorian calendar, which consists of 365 days. The reason why leap years are used is that it actually takes 365.2425 days for the Earth to complete one revolution around the Sun. Every 4 years the fractional part of 0.2425 adds up to an extra day, which is then added to the calendar on February 29th. Thus, leap years are those that are evenly divisible by 4, for example, 2020, 2024, 2028, 2032, …. However, there is still an additional smaller error in the fractional part, which is the 0.0025 part. Therefore, to account for this extra small deviation, it's defined that a year that is divisible by 100 is a leap only if it is also divisible by 400. Using this algorithm, the program calculates and prints all leap years in the interval of years that you specify in the options. You can also customize the format of the output list by entering a character to separate leap years. Timeabulous!

Leap Year Calculator Examples

Click to try!
click me

Find Leap Years in a Range

In this example, we find all leap years within the specified range. We specify the period of years from 2020 to 2060, and we find 11 leap years there. We display them in a vertical column.

2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060
Required options
These options will be used automatically if you select this example.
Enter the start range year.
Enter the end range year.
Enter a character to separate the printed leap years.
click me

Leap Years of the 21st Century

This example calculates all leap years in the 21st century. The twenty-first century begins in 2001 and lasts until 2100. We enter these years in the start and end range options and get a sequence of comma-separated leap years in the output.

2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, 2040, 2044, 2048, 2052, 2056, 2060, 2064, 2068, 2072, 2076, 2080, 2084, 2088, 2092, 2096
Required options
These options will be used automatically if you select this example.
Enter the start range year.
Enter the end range year.
Enter a character to separate the printed leap years.

Pro tips Master online time tools

You can pass options to this tool using their codes as query arguments and it will automatically compute output. To get the code of an option, just hover over its icon. Here's how to type it in your browser's address bar. Click to try!

https://onlinetools.com/time/find-leap-years?start-year=2020&end-year=2060&separator=%250A

All Time Tools

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Quickly convert time in 24 hour format to 12 hour format.
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Quickly subtract hours, minutes, and seconds from the given time.
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Quickly add days, months, and years to the given date.
Decrement a Calendar Date
Quickly subtract days, months, and years to from the given date.
Format a Clock Time
Quickly change the current time format to any new format.
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Quickly change the current date format to any new format.
Round a Clock Time
Quickly round the given clock time up or down.
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Quickly round the given calendar date up or down.
Truncate a Clock Time
Quickly drop seconds and minutes from a clock time.
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Quickly drop days and months from a calendar date.
Sort Clock Times
Quickly sort clock times in ascending or descending order.
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Quickly sort calendar dates in ascending or descending order.
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Quickly sort time intervals by their start time or length.
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Quickly sort date intervals by their start date or length.
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Quickly check if the given clock time is valid.
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Quickly check if the given calendar date is valid.
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Quickly find how many hours are in the given days.
Convert Hours to Days
Quickly find how many days are in the given hours.
Find a Zodiac Sign by Date
Quickly find the astrological sign by the birthday or any date.
Print Dates of All Zodiac Signs
Quickly print a list of the dates of all astrological signs.
Calculate Average Time
Quickly find the average value of multiple clock times.
Calculate Average Date
Quickly find the average value of multiple calendar dates.
Generate Random Clock Times
Quickly generate a list of random clock times.
Generate Random Dates
Quickly generate a list of random calendar dates.
Generate Custom Clock Times
Quickly create a list of clock times that match your criteria.
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Split Time into Intervals
Quickly split the given time period into multiple intervals.
Split Date into Intervals
Quickly split the given date period into multiple intervals.
Generate a Time Sequence
Quickly generate increasing or decreasing clock times.
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Quickly generate increasing or decreasing calendar dates.
Find Leap Years
Quickly print a list of all leap years.
Find Common Years
Quickly print a list of all common years.
Check If a Year Is a Leap Year
Quickly test if the given year is a leap year.
Check If a Year Is a Common Year
Quickly test if the given year is a common year.
Convert Cat's Age to Human Years
Quickly find how old a cat would be if it was a human.
Convert Human's Age to Cat Years
Quickly find how old a human would be if he/she was a cat.
Convert Dog's Age to Human Years
Quickly find how old a dog would be if it was a human.
Convert Human's Age to Dog Years
Quickly find how old a human would be if it was a dog.
Convert Gregorian Calendar to Julian Calendar
Quickly convert a modern Gregorian date to a Julian date.
Convert Julian Calendar to Gregorian Calendar
Quickly convert an ancient Julian date to a Gregorian date.
Convert a Date to a Julian Day
Quickly calculate the Julian day number for any calendar date.
Convert a Julian Day to a Date
Quickly convert the Julian day to a regular calendar date.
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Quickly print a list of all Easter dates for all years.
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Quickly generate increasing or decreasing UNIX timestamps.
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Quickly generate one or more random UNIX Epoch times.
Convert Regular Time to Military Time
Quickly convert a HH:MM:SS clock to a military HHMM clock.
Convert Military Time to Regular Time
Quickly convert a military clock HHMM to a HH:MM:SS clock.
Spell a Clock Time
Quickly write a clock time in text format (as English text).
Spell a Calendar Date
Quickly write a calendar date in text format (as English text).
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Quickly add slight perturbations to the given clock times.
Add Fuzziness to Calendar Dates
Quickly add slight perturbations to the given calendar dates.
Find Day of the Week
Quickly find what day of the week the given calendar date falls on.
Find Day of the Year
Quickly find what day of the year the given calendar date falls on.
Find Week of the Year
Quickly find what week of the year the given calendar date falls on.
Find Date by Day of the Year
Quickly calculate the calendar date from a day number of a year.
Calculate Clock Hand Angle
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Set Clock Hand Angle
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Find the Thanksgiving Day
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Analyze a Clock Time
Quickly show useful information about a particular clock time.
Analyze a Calendar Date
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Visualize Time Intervals
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Mirror a Clock Time
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Convert Time Between Timezones
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Convert Time Between Countries
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Coming Soon

These time tools are on the way!
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Draw a clock in Salvador Dali style showing custom time.

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Draw a 360° Clock

Draw a 360° clock with 360 degrees in a day.

Animate an Analog Clock

Create a GIF animation of an analog clock.

Animate a Digital Clock

Create a GIF animation of a digital clock.

Animate a Broken Clock

Create a GIF animation of a clock that's broken.

Draw a Daily Calendar

Draw a daily calendar for a single day.

Draw a Weekly Calendar

Draw a weekly calendar for any week of the month.

Draw a Yearly Calendar

Draw a yearly calendar for the entire year.

Draw a Lunar Calendar

Draw a calendar that shows moon phases.

Draw a Solar Calendar

Draw a calendar that shows the seasons and Sun's position.

Draw a Sunrise and Sunset Calendar

Draw a calendar that shows when the Sun rises and sets.

Draw a Moonrise and Moonset Calendar

Draw a calendar that shows when the Moon rises and sets.

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Draw an animation that counts down (or up) time.

Animate an Hourglass

Create a GIF animation of a sand clock.

Draw an Infinite Spiral Clock

Animate a timeless clock that goes in an infinite spiral.

Draw Time as a Pie Chart

Visualize the given clock time as a pie chart.

Draw Date as a Pie Chart

Visualize the current year as a pie chart.

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Visualize the given clock time as a bar chart.

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Visualize the current year as a bar chart.

Draw Time as a Pixel Wall

Visualize the given clock time as a pixel wall (1px = 1sec).

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Draw Time as Bubbles

Visualize the given clock time as bubbles.

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Visualize the current year as bubbles.

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Visualize the given clock time as an arrow.

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Convert regular clock time to binary clock time (bintime).

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Quickly regular calendar date to binary date (bindate).

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Convert Date to Decimal Date

Quickly regular calendar date to decimal date (decdate).

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Create a GIF animation of the Moon for a particular month.

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Create an animation of the Moon orbiting the Earth.

Animate Mercury's Orbit

Create a 88 day animation of the Mercury orbiting the Sun.

Animate Venus's Orbit

Create a 225 day animation of the Venus orbiting the Sun.

Animate Earth's Orbit

Create a 365 day animation of the Earth orbiting the Sun.

Animate Mars's Orbit

Create a 687 day animation of the Mars orbiting the Sun.

Animate Jupiter's Orbit

Create a 4,330 day animation of the Jupiter orbiting the Sun.

Animate Saturn's Orbit

Create a 10,756 day animation of the Saturn orbiting the Sun.

Animate Uranus's Orbit

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Animate Neptune's Orbit

Create a 60,190 day animation of the Neptune orbiting the Sun.

Animate Pluto's Orbit

Create a 90,560 day animation of the Pluto orbiting the Sun.

Animate Solar System

Create an animation of all planets in the Solar System.

Animate Mars's Moons

Create an animation of Phobos and Deimos orbiting Mars.

Animate Jupiter's Moons

Animate Io, Europa, Ganymede, Callisto orbiting Jupiter.

Animate Saturn's Moons

Animate Titan, Rhea, Iapetus, Enceladus orbiting Saturn.

Animate Uranus's Moons

Animate Titania, Oberon, Umbriel, Ariel, Miranda orbiting Uranus.

Animate Neptune's Moons

Animate Triton, Nereid, and Proteus orbiting Neptune.

Animate Pluto's Moons

Animate Charon, Nix, Hydra, Kerberos, Styx orbiting Pluto.

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Find dates when two or more planets align in a straight line.

Find Dates of Solar Eclipse

Find dates when the solar eclipse happens.

Find Dates of Lunar Eclipse

Find dates when the lunar eclipse happens.

Find Your Age on Other Planets

Calculate your age based on the orbital period of other planets.

Create a Time Matrix

Represent a clock time as a matrix.

Create a Date Matrix

Represent a calendar date as a matrix.

Create a Time Vector

Represent a clock time as a vector.

Create a Date Vector

Represent a calendar date as a vector.

Visualize Time Series

Draw a time series chart.

Find Overlapping Times

Given a bunch of time intervals, find overlapping intervals.

Generate Overlapping Times

Generate a bunch of overlapping time intervals.

Generate Non-overlapping Times

Generate a bunch of non-overlapping time intervals.

Generate Random Time Intervals

Generate random clock time intervals.

Find Overlapping Dates

Given a bunch of date intervals, find overlapping intervals.

Generate Overlapping Dates

Generate a bunch of overlapping date intervals.

Generate Non-overlapping Dates

Generate a bunch of non-overlapping date intervals.

Generate Random Date Intervals

Generate random calendar date intervals.

Swap Clock Hands

Swap a clock's hour hand with minute hand.

Reverse Clock Time

Find the reverse of the given clock time.

Invert Clock Time

Find the inverse of the given clock time.

Shift Clock Time

Shift the given clock time by any time interval.

Change Clock Scale

Change the clock scale from 24 hours to any other hours.

Generate Valid Clock Times

Generate a list of valid clock times (for testing).

Generate Invalid Clock Times

Generate a list of invalid clock times (for testing).

Generate Valid Calendar Dates

Generate a list of valid calendar dates (for testing).

Generate Invalid Calendar Dates

Generate a list of invalid calendar dates (for testing).

Add Errors to Clock Times

Create errors in the given clock times (for testing).

Add Errors to Calendar Dates

Create errors in the given calendar dates (for testing).

Convert Date to Seconds

Convert a calendar date to seconds.

Convert Seconds to Date

Convert seconds to a calendar date.

Convert English to Crontab

Create a crontab expression from human language.

Convert Crontab to English

Rewrite a crontab entry into human language.

Find Week of the Month

Quickly find the week of the month of a calendar date.

Find Days Since the Start of Year

Quickly find how many days have passed since start of the year.

Find Days Till the End of Year

Quickly find how many days are left till the end of the year.

Find Days Till a Specific Date

Quickly find how many days are left till a specific date.

Convert Seconds To Minutes

Find how many minutes are in the given seconds.

Convert Seconds To Hours

Find how many hours are in the given seconds.

Convert Seconds to Days

Find how many days are in the given seconds.

Convert Seconds to Weeks

Find how many weeks are in the given seconds.

Convert Seconds to Months

Find how many months are in the given seconds.

Convert Seconds to Years

Find how many years are in the given seconds.

Convert Minutes to Seconds

Find how many seconds are in the given minutes.

Convert Minutes To Hours

Find how many hours are in the given minutes.

Convert Minutes to Days

Find how many days are in the given minutes.

Convert Minutes to Weeks

Find how many weeks are in the given minutes.

Convert Minutes to Months

Find how many months are in the given minutes.

Convert Minutes to Years

Find how many years are in the given minutes.

Convert Hours To Seconds

Find how many seconds are in the given hours.

Convert Hours to Minutes

Find how many minutes are in the given hours.

Convert Hours to Weeks

Find how many weeks are in the given hours.

Convert Hours to Months

Find how many months are in the given hours.

Convert Hours to Years

Find how many years are in the given hours.

Convert Days to Seconds

Find how many seconds are in the given days.

Convert Days to Minutes

Find how many minutes are in the given days.

Convert Days to Weeks

Find how many weeks are in the given days.

Convert Days to Months

Find how many months are in the given days.

Convert Days to Years

Find how many years are in the given days.

Convert Weeks to Seconds

Find how many seconds are in the given weeks.

Convert Weeks To Minutes

Find how many minutes are in the given weeks.

Convert Weeks To Hours

Find how many hours are in the given weeks.

Convert Weeks to Days

Find how many days are in the given weeks.

Convert Weeks to Months

Find how many months are in the given weeks.

Convert Weeks to Years

Find how many years are in the given weeks.

Convert Months to Seconds

Find how many seconds are in the given months.

Convert Months To Minutes

Find how many minutes are in the given months.

Convert Months To Hours

Find how many hours are in the given months.

Convert Months to Days

Find how many days are in the given months.

Convert Months to Weeks

Find how many weeks are in the given months.

Convert Months to Years

Find how many years are in the given months.

Convert Years to Seconds

Find how many seconds are in the given years.

Convert Years To Minutes

Find how many minutes are in the given years.

Convert Years To Hours

Find how many hours are in the given years.

Convert Years to Days

Find how many days are in the given years.

Convert Years to Weeks

Find how many weeks are in the given years.

Convert Years to Months

Find how many months are in the given years.

Convert a Bird's Age to Human Years

Find how old a human would be if he/she was a bird.

Convert a Human's Age to Bird Years

Find how old a bird would be if it was a human.

Convert Earth Time to Mars Time

Convert clock time on Earth to clock time on Mars.

Convert Mars Time to Earth Time

Convert clock time on Mars to clock time on Earth.

Convert Earth Date/Time to Stardate

Convert Earth time to Star Trek's stardate.

Convert Stardate to Earth Date/Time

Convert Star Trek's stardate to Earth time.

Generate Equal H:M:S Times

Print a list of clock times with hours equal mins equal secs.

Generate Equal Y-M-D Dates

Print a list of calendar dates with years equal months equal days.

Set Straight Clock Hands

Print a list of all clock times when hands are in a straight line.

Normalize Clock Times

Given clock times in various formats, convert them to one format.

Normalize Calendar Dates

Given calendar dates in various formats, make them the same format.

Rotate Clock Times

Cyclically shift HH, MM, SS time parts to the left or right.

Rotate Calendar Dates

Cyclically shift YYYY, MM, DD date parts to the left or right.

Freeform Time Calculator

Perform freeform clock time arithmetics.

Freeform Date Calculator

Perform freeform calendar date arithmetics.

Calculate Clock Sum

Find the sum of hours plus minutes plus seconds.

Calculate Calendar Sum

Find the sum of years plus months plus days.

Find Clock Sum

Find clock hand position so that hr + min + sec equals your value.

Find Calendar Sum

Find calendar date so that year + months + day equals your value.

Generate Clock Emojis

Print all clock icons from 00:00 to 24:00.

Create Zalgo Time

Generate date and time that only Zalgo can understand.

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We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling our mission is to make people's lives easier, so we created this collection of time and date tools. All our tools share the same user interface, so as soon as you learn how to use one of the tools, you'll be a master of all tools. Behind the scenes, our time and date tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!

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