> (convert the date to float, add the number of seconds corresponding to 
> the duration (tricky in the case of months), and convert back to date 
> format)).

this is not good, because of time savings, bisextiles years, and so
on...
I know this is not a constructive answer, sorry..., but it is a problem
I've had with programs I wrote in others languages. It showed me that
one should not use timestamps but only predefined date constructors,
however I don't know how they work in Caml...

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