calculating the difference between 2 dates

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Dear all,
I would like to calculate the difference between the dates say,
20/11/08 and 12/10/2011 in weeks and in months
cheers

Risposta accettata

Walter Roberson
Walter Roberson il 25 Mag 2012
numdays = datenum('12/10/2011') - datenum('20/11/08');
numweeks = numdays / 7; %and round() or floor() or ceil() as appropriate
numdaysvec = datevec(numdays);
nummonths = numdaysvec(1) * 12 + numdaysvec(2) - 1;
Note that you might have to give datenum() a hint as to whether the first date is the 11th month of 2008 or the 8th month of 2011.
Also, I used a shortcut here of converting the day offset as if it was a date relative to "year 0". MATLAB has weak leap-year routines that believe that "year 0" was a leap year. More accurate would be to datevec() the original dates and do modular arithmetic.
Oh yes, you also need to decide whether dates in the same month count as "0 months" or as "1 month" for your purposes.
  4 Commenti
Walter Roberson
Walter Roberson il 26 Mag 2012
Your date '20/11/08' is ambiguous. MATLAB is guessing incorrectly about the format it is in. You should be telling MATLAB the format when you datenum() the string. http://www.mathworks.com/help/techdoc/matlab_prog/bspgcx2-1.html#bsplnu3-2
datenum('20/11/08', 'dd/yy/mm') or datenum('20/11/08', 'dd/mm/yy') as appropriate

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Più risposte (1)

Andy
Andy il 13 Mar 2018
Modificato: Andy il 13 Mar 2018
there's something better now since 2014 release I believe:
w = between(startRange,endRange,'weeks')
y = between(startRange,endRange,'years')
m = between(startRange,endRange,'months')
  2 Commenti
Peter Perkins
Peter Perkins il 15 Mar 2018
Indeed:
>> between(datetime('20-Nov-2008'),datetime('12-Oct-2011'),{'weeks' 'months'})
ans =
calendarDuration
34mo 3w
Rosanna
Rosanna il 11 Ott 2018
Hi all I have to compute the occurrence time (days from the starting date) of a large number (eg N=1000) of events, for which I have the Year, Month, Day, Hour, Minute in numerical format (eg 2008, 05, 23, 08, 34). How can I proceed? Thanks Rosanna

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