[Octave-bug-tracker] [bug #50673] datestr truncates fractional minutes rather than rounding

[Rik]

Update of bug #50673 (project octave):

              Item Group:                    None => Matlab Compatibility   
                  Status:                    None => Need Info              
                 Release:                   4.0.3 => dev                    
                 Summary: 'datestr' gives wrong result. Possibly a rounding
issue => datestr truncates fractional minutes rather than rounding

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Follow-up Comment #1:

Definitely looks like rounding.  datenum() calculates in days.  See below
where I calculate the expected difference in minutes.


octave:18> format long
octave:19> etime = datenum ('1:00') - datenum ('0:55')
etime =  0.00347222213167697
octave:20> minutes = etime * 24 * 60
minutes =  4.99999986961484


So the question is whether datestr should use round or whether it should
simply truncate the fractional part of minutes.  The current behavior is to
truncate as shown below.


octave:23> datestr (4.9/60/24)
ans = 12:04 AM
octave:24> datestr (4.1/60/24)
ans = 12:04 AM


One way to resolve this would be to test the equivalent code in Matlab.  If
they truncate results then Octave should too.  If they round results then
Octave should too.



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