tiagobento commented on issue #977:
URL:
https://github.com/apache/incubator-kie-issues/issues/977#issuecomment-1967100430
From the spec, we have:
> The value of a days and time duration can be expressed as a number of
seconds. E.g., $value_{dtd}$(P1DT1H) = 90000.
The $value_{dtd}$ function is one-to-one and so it has an inverse function
$value_{dtd^{-1}}$. E.g., $value_{dtd^{-1}}$
(90000) = P1DT1H.
and
> The value of a years and months duration can be expressed as a number of
months. E.g., $value_{ymd}$(P1Y1M) = 13.
The $value_{ymd}$ function is one-to-one and so it has an inverse function
$value_{ymd^{-1}}$. E.g., $value_{ymd^{-1}}$
(13) = P1Y1M
but such functions $value_{dtd}$, $value_{ymd}$ and its inverses do not
exist, as far as I can tell. If they did, we could do the conversion to
seconds/months, execute a `sum` then convert back to the desired duration
format.
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