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Trouble converting timestamp using date and date_vectors

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BenL
BenL on 13 Feb 2017
Commented: Walter Roberson on 13 Feb 2017
1) I have 6 variables, ref_year,mth,day,hr,min,sec that corresponds to a reference time. I am having trouble getting MATLAB to recognise it as a date vector when I put them into a single 1x6 matrix. How could I convert them into a datenum?
I understand DateVector function https://www.mathworks.com/help/matlab/ref/datenum.html#inputarg_DateVector accounts for it:
If an element falls outside the conventional range, datenum adjusts both that date vector element and the previous element. For example, if the minutes element is 70, datenum adjusts the hours element by 1 and sets the minutes element to 10. If the minutes element is -15, then datevec decreases the hours element by 1 and sets the minutes element to 45. Month values are an exception. datenum sets month values less than 1 to 1.

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Accepted Answer

Walter Roberson
Walter Roberson on 13 Feb 2017
base_ts = datenum([double([ref_year, ref_mth, ref_day, ref_hr, ref_min]), double(ref_sec)]);
timestamp = base_ts + secs_after_datenum / (24*60*60);

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Walter Roberson
Walter Roberson on 13 Feb 2017
Yes. Notice too that I used two different doubles, one for the int32 and one for the single: if I had used [] to put everything into the same vector first before doing the double() then the single would have been converted to int32 by the rules of []

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