Date by day number calculator
World's simplest time toolWith 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.
A link to this tool, including input, options and all chained tools.
Can't convert.
What is a date by day number calculator?
learn more about this toolThis 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 use100th, 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
Find the calendar date of
this year.
this year.
Which format to display the
found date in?
found date in?
Output the calendar dates
with full-width components.
with full-width components.
Construct your own date
format here.
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
Find the calendar date of
this year.
this year.
Which format to display the
found date in?
found date in?
Output the calendar dates
with full-width components.
with full-width components.
Construct your own date
format here.
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
Find the calendar date of
this year.
this year.
Which format to display the
found date in?
found date in?
Output the calendar dates
with full-width components.
with full-width components.
Construct your own date
format here.
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
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.
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.
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.
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.
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.
Subscribe! Never miss an update
Cool!
Notifications We'll let you know when we add this tool
Cool!
Feedback we'd love to hear from you!
Created with love by ![browserling]()
51K
@browserling
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!
Secret message
If you love our tools, then we love you, too! Use coupon code TIMELING to get a discount for our premium plans.
Privacy Policy we don't log data!
All conversions and calculations are done in your browser using JavaScript. We don't send a single bit about your input data to our servers. There is no server-side processing at all. We use Google Analytics and StatCounter for site usage analytics. Your IP address is saved on our web server for additional analytics. The free plan doesn't use cookies and don't store session information in cookies. The premium and team plans use cookies to store session information so that you are always logged in. We use your browser's local storage to save tools' input. It stays on your computer.
Terms of Service the legal stuff
By using Online Tools you agree to our Terms of Service. All tools are free for personal use but to use them for commercial purposes, you need to get a premium plan. You can't do illegal or shady things with our tools. We may block your access to tools, if we find out you're doing something bad. We're not liable for your actions and we offer no warranty. We may revise our terms at any time.
current year is used.