# 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.

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Date by day number calculator tool
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 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**

Find the calendar date of
this year.

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**

Find the calendar date of
this year.

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**

Find the calendar date of
this year.

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://onlinetimetools.com/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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