Julian Date Calendar

Julian Date Converter

Calendar Date β†’ Julian Day

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Julian Day β†’ Calendar Date

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2026 Day-of-Year Table

DayJanFebMarAprMayJunJulAugSepOctNovDec
1001032060091121152182213244274305335
2002033061092122153183214245275306336
3003034062093123154184215246276307337
4004035063094124155185216247277308338
5005036064095125156186217248278309339
6006037065096126157187218249279310340
7007038066097127158188219250280311341
8008039067098128159189220251281312342
9009040068099129160190221252282313343
10010041069100130161191222253283314344
11011042070101131162192223254284315345
12012043071102132163193224255285316346
13013044072103133164194225256286317347
14014045073104134165195226257287318348
15015046074105135166196227258288319349
16016047075106136167197228259289320350
17017048076107137168198229260290321351
18018049077108138169199230261291322352
19019050078109139170200231262292323353
20020051079110140171201232263293324354
21021052080111141172202233264294325355
22022053081112142173203234265295326356
23023054082113143174204235266296327357
24024055083114144175205236267297328358
25025056084115145176206237268298329359
26026057085116146177207238269299330360
27027058086117147178208239270300331361
28028059087118148179209240271301332362
29029088119149180210241272302333363
30030089120150181211242273303334364
31031090151212243304365

What is a Julian Date?

Day of Year NumberA Julian date (or Julian day number) is the sequential day number within a year. January 1 = 001, February 1 = 032, December 31 = 365 (366 in a leap year).
Who Uses Julian Dates?Widely used by the US military, aviation, and the food industry (expiry codes like β€œ26158” = day 158 of 2026 = June 7). Also used in science and programming.
Reading a Julian Date CodeA 5-digit code like 26158 means year 2026, day 158 (June 7). A 7-digit variant like 2026158 uses a 4-digit year. Always verify the format used by the source document.
Not the Julian CalendarThis is different from the ancient β€œJulian Calendar” (pre-Gregorian, from 45 BC). Modern Julian day-of-year numbering uses the standard Gregorian calendar β€” just numbered sequentially from January 1.