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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.
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?

learn more about this tool
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 use
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
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Draw a weird-looking clock that shows a particular time.
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Create a GIF animation of a digital clock.
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Create a GIF animation of a clock that's broken.
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Draw a daily calendar for a single day.
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Draw a weekly calendar for any week of the month.
Draw a Yearly Calendar
Draw a yearly calendar for the entire year.
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Draw a calendar that shows moon phases.
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Draw a calendar that shows the seasons and Sun's position.
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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.
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.
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Visualize the given clock time as a pixel wall (1px = 1sec).
Draw Date as a Pixel Wall
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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
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Convert Date to Binary Date
Quickly regular calendar date to binary date (bindate).
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Convert regular clock time to decimal clock time (dectime).
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Quickly regular calendar date to decimal date (decdate).
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Convert regular clock time to hexadecimal time (hextime).
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Quickly regular calendar date to hexadecimal date (hexdate).
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Create a GIF animation of the Moon for a particular month.
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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.
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Create a 60,190 day animation of the Neptune orbiting the Sun.
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Create a 90,560 day animation of the Pluto orbiting the Sun.
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Create an animation of Phobos and Deimos orbiting Mars.
Animate Jupiter's Moons
Animate Io, Europa, Ganymede, Callisto orbiting Jupiter.
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Animate Titan, Rhea, Iapetus, Enceladus orbiting Saturn.
Animate Uranus's Moons
Animate Titania, Oberon, Umbriel, Ariel, Miranda orbiting Uranus.
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Animate Triton, Nereid, and Proteus orbiting Neptune.
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Find dates when the solar eclipse happens.
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Find dates when the lunar eclipse happens.
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Represent a calendar date as a matrix.
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Generate a bunch of overlapping date intervals.
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Generate a bunch of non-overlapping date intervals.
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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).
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Create errors in the given calendar dates (for testing).
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Quickly find how many days are left till the end of the year.
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Quickly find how many days are left till a specific date.
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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.
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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.
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Convert clock time on Earth to clock time on Mars.
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Convert clock time on Mars to clock time on Earth.
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Print a list of clock times with hours equal mins equal secs.
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Print a list of calendar dates with years equal months equal days.
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Perform freeform clock time arithmetics.
Freeform Date Calculator
Perform freeform calendar date arithmetics.
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Find the sum of years plus months plus days.
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Find clock hand position so that hr + min + sec equals your value.
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Find calendar date so that year + months + day equals your value.
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