java - Joda time, Period to total millis -

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i'm trying total amount of milliseconds (not millis field) period object instance. i've tried multiple conversions, couldn't find method giving it.

has ever needed , managed retrieve ?

(i need patch, figure out negative period; negative millis = negative period.)

you can't millis directly period, since fields months , years variable in terms of milliseconds.

in order make work, need supply "baseline" instant period can calculate actual millisecond duration.

for example, period.todurationfrom , period.todurationto methods take such baseline instant, , calculate duration object, can obtain millis.

the javadoc todurationfrom says:

gets total millisecond duration of period relative start instant. method adds period specified instant in order calculate duration.

an instant must supplied duration of period varies. example, period of 1 month vary between equivalent of 28 , 31 days in milliseconds due different length months. similarly, day can vary @ daylight savings cutover, typically between 23 , 25 hours.

so need pick appropriate baseline instant application.


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