MATLAB: Get UNIX standard timestamp on MATLAB

timestamp

Hello to everybody!

I got a question about how to get UNIX standard timestamp on MATLAB, which is the number of seconds from Jan 1 1970.

By referring to MATLAB website, I think `now` is the command that generate the number of days from Jan 1 0000.

https://www.mathworks.com/help/matlab/ref/now.html

But what I want is to get the timestamp that is the same to the one generated by time.time() in Python.

Best Answer

Use posixtime.

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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: Hi, i have two dates like 2013_12_28 and 2014_01_06, and i want to calculate the mean date (2014_01_01) which would be in the form of 2014.0014

md = mean(datenum({'2013_12_28', '2014_01_06'}, 'YYYY_mm_dd'));
dv = datevec(md);
days_into_year = md - datenum([dv(1),1,1]);

But once you have days_into_year you have to convert that into a year fraction, which requires careful definition of how long a "year" is. Is a "year" 365 days, always? Is a "year" 365.2421875 days? Is a "year" 365 days for non-leap years but 366 days for leap-years? If so then should it be 365 days for dates in the year before the leap day but 366 for dates on or after the leap day?

Converting to a specific date is much easier, and getting the result in terms of days is easy, but fraction of a year needs clarification.

Best Answer

Related Solutions

MATLAB: Vector of dates going back one rolling year

MATLAB: Hi, i have two dates like 2013_12_28 and 2014_01_06, and i want to calculate the mean date (2014_01_01) which would be in the form of 2014.0014

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