Time.parse('2009-01-01')+15.days+0.5.days
=> Fri Jan 16 00:00:00 +0100 2009
Time.parse('2009-01-01')+15.days+0.5.days.to_i
=> Fri Jan 16 12:00:00 +0100 2009
12.hours gone :(
ruby version 1.8.7
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Michael Grosser, the Blog 
I think it would be more expressive to say:
Time.parse(‘2009-01-01’)+15.days+12.hours
which works properly. The problem appears to be that 0.5.days returns a Float, whereas 15.days returns a FixNum.
yep, it works with hours.
0.5.days is not a float though (in second terms) very strange behavior.