Not sure what type of document you are referring to. If you were ordered to serve something within a certain number of days, if the order did not specify court v. calendar days, you can count calendar days.
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Check Los Angeles Superior Court Local Rules, Rule 5.14 (http://www.lasuperiorcourt.org/courtrules/ui/?ch=Chap5&tab=2) as to the specific timing and documents to be exchanged and filed. You should really seek the assistance of a local family law lawyer in getting this done correctly or you could run into serious problems with the admission of evidence necessary for your case.