problem parsing time out of datetime object

[AG]

I am trying to parse a datetime string into two pieces, date and time, and
I'm trying to figure out why this code does not work.  According to the docs
it seems that a call to rem on a datetime will give you the time but it
doesn't seem to do that.

dt_num = datenum('2013/05/29 00:00:00','YYYY/DD/MM HH:MM:SS')

 d_num = floor(dt_num)
 t_num = rem(dt_num,1)

datestr(d_num) ## ans = 05-Jan-2013  (RIGHT!)
datestr(t_num)  ## ans = 31-Dec--001 (WRONG)

Much appreciated.
Platform: Win 10, Octave. 4.2.1 



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