Can't subtract from time,date, can only add

I've been having some trouble with times and dates. I wanted to perform a time correction calculation, that is, to find the difference between two times, then add the difference to a third time as a way of "correcting" it. So, you can add and subtract time-date values in Numbers, and you get the difference in a decimal fraction of days. That is, a day is 1, a half a day is .5, etc. This is the same way Excel does things. So far so good.
The problem is that, for some reason, you can add to data-time values, but not subtract. For example:
2/27/2008 9:30:00 PM + .01 = 2/27/2008 9:44:00 PM
great, no problem, but...
2/27/2008 9:30:00 PM - .01 = 2/27/2008 9:30:00 PM
Huh? Why can't I subtract? What's even stranger is that it works of you do this:
2/27/2008 9:30:00 PM + (-.01) = 2/27/2008 9:15:00 PM
No that's messed up. Subtraction fails but adding a negative number works? This is a crazy bug.

Hello
For the add/substract a constant, my first guess was quite simple.
The parser is defined to accept the operator + not the operator -.
If it finds a +, is parse the parameter which may be positive or negative.
If it finds a -, it treats it as a "not allowed" one.
Alas it's a wrong description.
If I try to add 1.1, it works.
If I try to substract 1.1, the integer part is substracted, not the decimal part.
So, it can't be a feature but a bug.
I'm a bit reluctant to report it because I'm afraid that the result would be : disable the tip fooling the beast with a fake addition.
What's your advice ?

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Can't subtract from time,date, can only add

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