How to convert date to day number?

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miguel angel torres quintero
评论： Jan 2017-8-1
Hello I wanna convert a date to day number. For example: 2012-Junuary-12 is equal to 12 days (we are talking about 12 days passed of 365 day) I don´t refer to Julian Day.
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James Tursa
James Tursa 2017-7-28
编辑：per isakson 2017-7-28
@Jan: Julian Date and Day Of Year are two different things. Julian Date has a very specific meaning. E.g. from the USNO:
http://aa.usno.navy.mil/data/docs/JulianDate.php
Or if you prefer Wiki
https://en.wikipedia.org/wiki/Julian_day
Jan
Jan 2017-8-1
Thanks, James. I hoped that the OP explain maore details also, e.g. how the input is represented and why he mentions the Julian Day.

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回答（1 个）

Steven Lord
Steven Lord 2017-7-28
dt = datetime('2012-January-12')
day(dt, 'dayofyear')
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Peter Perkins
Peter Perkins 2017-8-1
And also:
>> dt = datetime(2012,1:3,12)
dt =
1×3 datetime array
12-Jan-2012 12-Feb-2012 12-Mar-2012
>> dt.Format = 'yyyy:D'
dt =
1×3 datetime array
2012:12 2012:43 2012:72

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