How to find the day number of any year from a date?
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Md. Golam Mostafa
il 23 Lug 2015
Modificato: Sergey Kostrukov
il 12 Feb 2022
I am very new in programming and therefore it is probably a novice's question. I have to write a script that takes a number of day(dd), month(mm) and year(yyyy)values arranged in three separate columns of a MATLAB variable and gives the day number of the year(e.g. for 03 March 2012, 31+29+3=63) as output.
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Peter Perkins
il 23 Lug 2015
If you are using R2014b or later, the datetime data type allows you to compute the day of year using the day function:
>> x = [2012 1 2; 2012 3 3; 2013 3 3]
x =
2012 1 2
2012 3 3
2013 3 3
>> d = datetime(x)
d =
02-Jan-2012
03-Mar-2012
03-Mar-2013
>> day(d,'dayofyear')
ans =
2
63
62
2 Commenti
Peter Perkins
il 24 Lug 2015
Presumably, you are not "using R2014b or later". datetime did not exist prior to that.
Più risposte (3)
Andrei Bobrov
il 24 Lug 2015
x = [2012 1 2; 2012 3 3; 2013 3 3];
d = datenum(x);
out = d - datenum(year(d),1,1) + 1;
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Sergey Kostrukov
il 12 Feb 2022
Modificato: Sergey Kostrukov
il 12 Feb 2022
Fractional value of days since biginning of the year (0-364.9999):
daysFrac = days(currentTime - datetime(year(currentTime), 1, 1, TimeZone=currentTime.TimeZone))
To get the whole number starting from 1 (i.e. day index):
floor(daysFrac + 1)
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