MATLAB: Convert date to specific format julian date

date conversion

Need to convert calendar date to Julian date in a specific format (YYDDD). Ex: Day = (2016-05-04,2016-08-24,2016-12-31) J-Day = (16125,16237,16366)

Any help would be appreciated. Thanks.

Best Answer

Datetime works nicely. I believe it came out in R2014b.

see the Datetime function

a = datetime('2016-05-04');
a.Format='yyddd'

Related Solutions

MATLAB: Fraction of a day to HH:MM:SS

This would work:

inputdate = '17037.46688591';
jday = inputdate(1:5);
date = datetime(jday, 'InputFormat', 'yyDDD') + days(mod(str2double(inputdate), 1))

assuming that .46688591 is a fraction of a day.

MATLAB: Vector of dates going back one rolling year

You can subtract one from the year field:

>> Vend = clock;
>> Nend = datenum(Vend);
>> Nbeg = datenum([Vend(1)-1,Vend(2:end)]);
>> Nall = Nbeg:Nend;
>> Vall = datevec(Nall);

You might also want to adjust Nbeg by one, depending on whether you want to include start on the same date as the period ends on.

EDIT this code gives just first of each month, over the past twelve months (regardless of the end month):

>> Vend = clock;
>> Nbeg = datenum([Vend(1)-1,1+Vend(2),1]);
>> Vbeg = datevec(Nbeg);
>> Nall = datenum(Vbeg(1),Vbeg(2)+(11:-1:0),1);
>> datestr(Nall)
ans =
01-Nov-2015
01-Oct-2015
01-Sep-2015
01-Aug-2015
01-Jul-2015
01-Jun-2015
01-May-2015
01-Apr-2015
01-Mar-2015
01-Feb-2015
01-Jan-2015
01-Dec-2014

Best Answer

Related Solutions

MATLAB: Fraction of a day to HH:MM:SS

MATLAB: Vector of dates going back one rolling year

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