MATLAB: How to avoid dates being writen in scientific notation

datestrstr2num

I made my dates using:

m(1,1) = str2num(datestr([2015,8,10,12,0,0],'yyyymmddhhMM'));

which writes date in scientific notation into m. Is there any way to avoid that? I want my dates to be as simple as 201508101200 in m.

Best Answer

If you really want it as an integer:

m = uint64(str2num(datestr([2015,8,10,12,0,0],'yyyymmddhhMM')));

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MATLAB: How to remove exponential notation

I actually wrote a function to do some of that just for the fun of it yesterday.

engstr = @(x) [x*10.^(-3*floor(log10(abs(x))/3))  3*floor(log10(abs(x))/3)];
z = 1.6755e+05;
Result = engstr(z)
Result =
  167.5500    3.0000

The ‘engstr’ function produces a (1x2) vector, the first element is the engineering notation mantissa, and the second is the exponent. Just use the first element to get the result you want.

MATLAB: How to calculate the difference between dates when the date is in the yyyy-mm-dd format

The function DATENUM in MATLAB allows the conversion of various date formats to a serial date number. Date can essentially be expressed in three formats in MATLAB . They are :

Date String: '24-Oct-2003 12:45:07'

Date Vector: [2003 10 24 12 45 07]

Serial Date Number: 7.3188e+005

In order to be able to subtract dates the "Serial Date Number" format is the most useful. It essentially returns the number of days that have elapsed after an arbitrary start date ( the default is Jan 01 0000, but this can be set to any date you prefer).

For example if one wanted to find the number of days between 02/01/2007 and 04/13/2008, the following example could be used

firstdate = datenum(2007,02,01);  % note year,month,day
seconddate= datenum(2007,04,13);
diff_date =abs(firstdate -seconddate);

The input would need to modified to work with DATENUM in the following manner

temp1=num2str(date2)
temp2=strcat(temp1(1:4),'.',temp1(5:6),'.',temp1(7:8))
res = datenum(temp2,'yy.mm.dd')

Best Answer

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MATLAB: How to remove exponential notation

MATLAB: How to calculate the difference between dates when the date is in the yyyy-mm-dd format

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