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Date by Day Number Calculator

World's Simplest Time Tool

With this browser-based application, you can find a calendar date by the given day of the year. You can enter the day number as input, specify the search year, and you'll get the full calendar date corresponding to the given day number as output. You can also enter several day numbers into the input and find calendar dates for all of them at once. You can also choose the output date format, control the padding, and construct custom date formats. Created by computer nerds from team Browserling.

᠎᠎᠎          Tool Options

Calendar Year

Find the calendar date of
this year.
If no date is specified, the
current year is used.

Date Format

Which format to display the
found date in?
Output the calendar dates
with full-width components.

Custom Format Constructor

Construct your own date
format here.
First, select the custom mode
from the list of formats and
then use the notation below:

• YYYY/YY – year,
• MMMM/MMM/MM – month,
• dddd/ddd – day of week,
• DD – day.

What Is a Date by Day Number Calculator?

This is a quick online utility for calculating the date from the given day count of the given year. For example, you can ask the program to find the 100th day of 2022, and it will display 2022-04-10. By default, it displays the date of the current year. If it's 2022 today, then it will use this year for calculations, or if it's 2026, then it will use 2026 for the calculations. If you want to find a date for past or future years, then you can specify the year in the options. For example, if you enter the year 1995 in the options, then you will find that the 100th day of 1995 happened on 1995-04-10. You can also change the output date format, and get "April 10, 1995" or "1995, 10 April", or "Sunday, April 10, 1995". Additionally, you can create an original date format by using the date format constructor. By switching to the custom mode in the list of formats, you can enter any date pattern in the constructor field. For example, if you enter "day: MM, month: DD, year: YYYY", you'll get "day: 04, month: 10, year: 1995" as the result. You can control whether date components are padded to their full-width via the padding option. For example, if the padding option is off, then the date will be printed in a shortened format "1995-4-1" but if it's on, then it will be padded as "1995-04-01". As a common year consists of 365 days and a leap year of 366 days, then these are the limits for the day counter value for a single year. However, if you enter a day counter greater than these values, then our algorithm will generate the calendar date of the next year. For example, if the current year is 2022, and you enter 500 as the input, you will get 2023-05-15 (next year) as the output. In case you need to do the reverse operation and find the day number for the given calendar year , then we have a find day of the year tool. Timeabulous!


Date by Day Number Calculator Examples

Click to try!

100th, 200th, and 300th Day of the Year

In this example, we calculate which calendar date corresponds to the 100th, 200th, and 300th day of the year. We omit the year field in the options (leave it empty) to get the current year as the output (as we wrote this example in 2022, we get the dates of the year 2022 in the output). We use the standard ISO date format YYYY-MM-DD for the output and add padding to the calculated dates.

100 200 300
2022-04-10 2022-07-19 2022-10-27
Required options
These options will be used automatically if you select this example.
Find the calendar date of
this year.
Which format to display the
found date in?
Output the calendar dates
with full-width components.
Construct your own date
format here.

Binary Day Numbers

As true computer nerds, we love binary numbers so we decided to run a binary day counter throughout the year and see what calendar dates we come up with. We use the year 1945 for all dates because it's the year the first general-purpose digital computer was built. We also remove the padding from the output and print the dates in text format with the full name of each month.

1 10 11 100 101 110 111
January 1, 1945 January 10, 1945 January 11, 1945 April 10, 1945 April 11, 1945 April 20, 1945 April 21, 1945
Required options
These options will be used automatically if you select this example.
Find the calendar date of
this year.
Which format to display the
found date in?
Output the calendar dates
with full-width components.
Construct your own date
format here.

Prime Day Counts

In this example, we paste a list of prime numbers from 2 to 367 as input. We enter the leap year 2024 in the options as the base year and turn the given primes into calendar dates. Since a leap year consists of 366 days, the last 367th day in the list doesn't fit in the current year 2025 so it's the first day of the next year 2025. We switch to a custom date format, and create a fresh new format using a pattern "ddd, MMM of DD, YYYY" that includes the day name as well.

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367
Tue, Jan of 2, 2024 Wed, Jan of 3, 2024 Fri, Jan of 5, 2024 Sun, Jan of 7, 2024 Thu, Jan of 11, 2024 Sat, Jan of 13, 2024 Wed, Jan of 17, 2024 Fri, Jan of 19, 2024 Tue, Jan of 23, 2024 Mon, Jan of 29, 2024 Wed, Jan of 31, 2024 Tue, Feb of 6, 2024 Sat, Feb of 10, 2024 Mon, Feb of 12, 2024 Fri, Feb of 16, 2024 Thu, Feb of 22, 2024 Wed, Feb of 28, 2024 Fri, Mar of 1, 2024 Thu, Mar of 7, 2024 Mon, Mar of 11, 2024 Wed, Mar of 13, 2024 Tue, Mar of 19, 2024 Sat, Mar of 23, 2024 Fri, Mar of 29, 2024 Sat, Apr of 6, 2024 Wed, Apr of 10, 2024 Fri, Apr of 12, 2024 Tue, Apr of 16, 2024 Thu, Apr of 18, 2024 Mon, Apr of 22, 2024 Mon, May of 6, 2024 Fri, May of 10, 2024 Thu, May of 16, 2024 Sat, May of 18, 2024 Tue, May of 28, 2024 Thu, May of 30, 2024 Wed, Jun of 5, 2024 Tue, Jun of 11, 2024 Sat, Jun of 15, 2024 Fri, Jun of 21, 2024 Thu, Jun of 27, 2024 Sat, Jun of 29, 2024 Tue, Jul of 9, 2024 Thu, Jul of 11, 2024 Mon, Jul of 15, 2024 Wed, Jul of 17, 2024 Mon, Jul of 29, 2024 Sat, Aug of 10, 2024 Wed, Aug of 14, 2024 Fri, Aug of 16, 2024 Tue, Aug of 20, 2024 Mon, Aug of 26, 2024 Wed, Aug of 28, 2024 Sat, Sep of 7, 2024 Fri, Sep of 13, 2024 Thu, Sep of 19, 2024 Wed, Sep of 25, 2024 Fri, Sep of 27, 2024 Thu, Oct of 3, 2024 Mon, Oct of 7, 2024 Wed, Oct of 9, 2024 Sat, Oct of 19, 2024 Sat, Nov of 2, 2024 Wed, Nov of 6, 2024 Fri, Nov of 8, 2024 Tue, Nov of 12, 2024 Tue, Nov of 26, 2024 Mon, Dec of 2, 2024 Thu, Dec of 12, 2024 Sat, Dec of 14, 2024 Wed, Dec of 18, 2024 Tue, Dec of 24, 2024 Wed, Jan of 1, 2025
Required options
These options will be used automatically if you select this example.
Find the calendar date of
this year.
Which format to display the
found date in?
Output the calendar dates
with full-width components.
Construct your own date
format here.

Pro tips Master online time tools

You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!

https://onlinetools.com/time/find-date-by-day-of-year?input=100%0A200%0A300&year=&padding=true&format=YYYY-MM-DD&custom-format=YYYY.MM.DD

All Time Tools

Didn't find the tool you were looking for? Let us know what tool we are missing and we'll build it!
Quickly visualize your life in weeks or months.
Quickly draw a wall clock that shows a particular time.
Quickly draw an electronic clock that shows a particular time.
Quickly draw a monthly calendar for any month of the year.
Quickly print a list of neat-looking clock times (such as 10:11:12).
Quickly print a list of neat-looking calendar dates (such as 2055-05-05).
Quickly print a list of symmetric clock times (such as 05:22:50).
Quickly print a list of symmetric dates (such as 2020-02-02).
Quickly convert clock time in H:M:S format to seconds.
Quickly convert seconds to clock time in H:M:S format.
Quickly convert time in 24 hour format to 12 hour format.
Quickly convert time in 12 hour format to 24 hour format.
Quickly find how many seconds have passed since midnight.
Quickly find how many seconds are left till midnight.
Quickly find the difference between two clock times.
Quickly find the difference between two calendar dates.
Quickly find the age difference between two or more people.
Quickly add hours, minutes, and seconds to the given time.
Quickly subtract hours, minutes, and seconds from the given time.
Quickly add days, months, and years to the given date.
Quickly subtract days, months, and years to from the given date.
Quickly change the current time format to any new format.
Quickly change the current date format to any new format.
Quickly round the given clock time up or down.
Quickly round the given calendar date up or down.
Quickly drop seconds and minutes from a clock time.
Quickly drop days and months from a calendar date.
Quickly sort clock times in ascending or descending order.
Quickly sort calendar dates in ascending or descending order.
Quickly sort time intervals by their start time or length.
Quickly sort date intervals by their start date or length.
Quickly check if the given clock time is valid.
Quickly check if the given calendar date is valid.
Quickly find how many hours are in the given days.
Quickly find how many days are in the given hours.
Quickly find the astrological sign by the birthday or any date.
Quickly print a list of the dates of all astrological signs.
Quickly find the average value of multiple clock times.
Quickly find the average value of multiple calendar dates.
Quickly generate a list of random clock times.
Quickly generate a list of random calendar dates.
Quickly create a list of clock times that match your criteria.
Quickly generate a list of calendar dates that match your criteria.
Quickly split the given time period into multiple intervals.
Quickly split the given date period into multiple intervals.
Quickly generate increasing or decreasing clock times.
Quickly generate increasing or decreasing calendar dates.
Quickly print a list of all leap years.
Quickly print a list of all common years.
Quickly test if the given year is a leap year.
Quickly test if the given year is a common year.
Quickly find how old a cat would be if it was a human.
Quickly find how old a human would be if he/she was a cat.
Quickly find how old a dog would be if it was a human.
Quickly find how old a human would be if it was a dog.
Quickly convert a modern Gregorian date to a Julian date.
Quickly convert an ancient Julian date to a Gregorian date.
Quickly calculate the Julian day number for any calendar date.
Quickly convert the Julian day to a regular calendar date.
Quickly print a list of all Easter dates for all years.
Quickly convert a UNIX Epoch time to a human-readable time.
Quickly convert human-readable time to a UNIX Epoch time.
Quickly generate increasing or decreasing UNIX timestamps.
Quickly generate one or more random UNIX Epoch times.
Quickly convert a HH:MM:SS clock to a military HHMM clock.
Quickly convert a military clock HHMM to a HH:MM:SS clock.
Quickly write a clock time in text format (as English text).
Quickly write a calendar date in text format (as English text).
Quickly add slight perturbations to the given clock times.
Quickly add slight perturbations to the given calendar dates.
Quickly find what day of the week the given calendar date falls on.
Quickly find what day of the year the given calendar date falls on.
Quickly find what week of the year the given calendar date falls on.
Quickly calculate the calendar date from a day number of a year.
Quickly find the angle between the hour hand and minute hand.
Quickly print a list of all clock times with a specific hand angle.
Quickly print all dates when a specific day happens.
Quickly find all Fridays that fall on the 13th day of the month.
Quickly create a list of all Independence Day dates.
Quickly create a list of all Christmas Day dates.
Quickly create a list of all New Year dates.
Quickly create a list of all Thanksgiving dates.
Quickly show useful information about a particular clock time.
Quickly show useful information about a particular calendar date.
Quickly draw a timeline of multiple time intervals.
Quickly draw a visualization of multiple date intervals.
Quickly find the time a clock shows if you look at it in a mirror.
Quickly convert time and date from one timezone to another.
Quickly convert time and date from one country to another.
Quickly print the season (winter, spring, summer, autumn) by date.

Coming Soon

These time tools are on the way!
Draw a Binary Clock

Draw a binary clock that shows time in base two.

Draw a Salvador Dali Clock

Draw a clock in Salvador Dali style showing custom time.

Draw a Weird Clock

Draw a weird-looking clock that shows a particular time.

Draw a Pi Clock

Draw a π clock with π hours in a day.

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.

Create an Animated Timer

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.

Draw Time as a Bar Chart

Visualize the given clock time as a bar chart.

Draw Date as a Bar Chart

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).

Draw Date as a Pixel Wall

Visualize the current year as a pixel wall (1px = 1day).

Draw Time as Bubbles

Visualize the given clock time as bubbles.

Draw Date as Bubbles

Visualize the current year as bubbles.

Draw a Time Arrow

Visualize the given clock time as an arrow.

Convert Time to Percentage

Quickly calculate time passed and left in the current day as pct.

Convert Date to Percentage

Quickly calculate time passed and left in the current year as pct.

Convert Time to Binary Time

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

Convert Date to Binary Date

Quickly regular calendar date to binary date (bindate).

Convert Time to Decimal Time

Convert regular clock time to decimal clock time (dectime).

Convert Date to Decimal Date

Quickly regular calendar date to decimal date (decdate).

Convert Time to Hex Time

Convert regular clock time to hexadecimal time (hextime).

Convert Date to Hex Date

Quickly regular calendar date to hexadecimal date (hexdate).

Animate Moon's Phases

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

Animate Moon's Orbit

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

Create a 30,687 day animation of the Uranus orbiting the Sun.

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.

Find When Planets Align

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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