LawToolBox calculates the Motion for Summary Judgement deadlines as a conservative interpretation for the possible latest date in the state of California.
CCP 1013 ("1013).
(a) In case of service by mail, the notice or other paper shall be deposited in a post office, mailbox, subpost office, substation, or mail chute, or other like facility regularly maintained by the United States Postal Service, in a sealed envelope, with postage paid, addressed to the person on whom it is to be served, at the office address as last given by that person on any document filed in the cause and served on the party making service by mail; otherwise at that party’s place of residence. Service is complete at the time of the deposit, but any period of notice and any right or duty to do any act or make any response within any period or on a date certain after service of the document, which time period or date is prescribed by statute or rule of court, shall be extended five calendar days, upon service by mail, if the place of address and the place of mailing is within the State of California, 10 calendar days if either the place of mailing or the place of address is outside the State of California but within the United States, and 20 calendar days if either the place of mailing or the place of address is outside the United States, but the extension shall not apply to extend the time for filing notice of intention to move for new trial, notice of intention to move to vacate judgment pursuant to Section 663a, or notice of appeal. This extension applies in the absence of a specific exception provided for by this section or other statute or rule of court.").
CCP 12a ("(a) If the last day for the performance of any act provided or required by law to be performed within a specified period of time is a holiday, then that period is hereby extended to and including the next day that is not a holiday. For purposes of this section, “holiday” means all day on Saturdays, all holidays specified in Section 135 and, to the extent provided in Section 12b, all days that by terms of Section 12b are required to be considered as holidays.").