MATLAB: Convert to MATLAB date number

datenumdatestrmatlab time

How can I convert

'2015-033T18:00:00'

to Matlab date number? 033 is the day of year, i.e. Feb 2.

Best Answer

If you have a newer version of Matlab, you can parse this directly to a datetime object

a = '2015-033T18:00:00';
d = datetime(a, 'InputFormat', 'yyyy-D''T''HH:mm:ss')

And if you need a datenumber instead:

 dn = datenum(d)

For Matlab releases before 2014b, I think you'll have to parse manually:

tmp = textscan(a, '%f-%fT%f:%f:%f')
dn = datenum(tmp{1},1,1) + (tmp{2}-1) + tmp{3}/24 + tmp{4}/(24*60) + tmp{5}/(24*60*60)

Related Solutions

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

MATLAB: Using datenum over several years

InDate = '2011-01-01 00:00';
FiDate = '2021-01-31 23:57';
% Create hourly spaced datetimes
v = datenum(InDate):1/24:datenum(FiDate);
% Shift with respect to InDate
v - datenum(InDate)

If you need to start from 1 just add '+ 1' to the last statement

Best Answer

Related Solutions

MATLAB: Vector of dates going back one rolling year

MATLAB: Using datenum over several years

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