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Some data sets specify dates using the year and day the year rather than the year, month, and also day of month. The work of year (DOY) is the sequential day number starting with day 1 ~ above January 1st.

There room two calendars--one for normal years through 365 days, and one for leap years with 366 days. Leap years are divisible through 4. Centuries, choose 1900, space not leap years uneven they are divisible by 400. So, 2000 was a leap year.

To discover the work of year number for a standard date, scan down the Jan tower to find the work of month, then scan across to the suitable month column and read the job of year number. Turning back the procedure to find the standard date for a provided day of year.

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The job of year number is occasionally referred to together the "Julian" date, yet astronomers have actually a very specific meaning of Julian day (http://aa.usno.navy.mil/data/docs/JulianDate.html).

### Normal Year

JanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJunJulAugSepOctNovDec
1326091121152182213244274305335
2336192122153183214245275306336
3346293123154184215246276307337
4356394124155185216247277308338
5366495125156186217248278309339
6376596126157187218249279310340
7386697127158188219250280311341
8396798128159189220251281312342
9406899129160190221252282313343
104169100130161191222253283314344
114270101131162192223254284315345
124371102132163193224255285316346
134472103133164194225256286317347
144573104134165195226257287318348
154674105135166196227258288319349
164775106136167197228259289320350
174876107137168198229260290321351
184977108138169199230261291322352
195078109139170200231262292323353
205179110140171201232263293324354
215280111141172202233264294325355
225381112142173203234265295326356
235482113143174204235266296327357
245583114144175205236267297328358
255684115145176206237268298329359
265785116146177207238269299330360
275886117147178208239270300331361
285987118148179209240271301332362
2988119149180210241272302333363
3089120150181211242273303334364
3190151212243304365

### Leap Year

JanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJunJulAugSepOctNovDec
1326192122153183214245275306336
2336293123154184215246276307337
3346394124155185216247277308338
4356495125156186217248278309339
5366596126157187218249279310340
6376697127158188219250280311341
7386798128159189220251281312342
8396899129160190221252282313343
94069100130161191222253283314344
104170101131162192223254284315345
114271102132163193224255285316346
124372103133164194225256286317347
134473104134165195226257287318348
144574105135166196227258288319349
154675106136167197228259289320350
164776107137168198229260290321351
174877108138169199230261291322352
184978109139170200231262292323353
195079110140171201232263293324354
205180111141172202233264294325355
215281112142173203234265295326356
225382113143174204235266296327357
235483114144175205236267297328358
245584115145176206237268298329359
255685116146177207238269299330360
265786117147178208239270300331361
275887118148179209240271301332362
285988119149180210241272302333363
296089120150181211242273303334364
3090121151182212243274304335365
3191152213244305366