definiens: will be to calendar days, and means all days other than Saturdays, Sundays, or a national or local holiday recognized in the United States, any reference to will be to the month and not a 30 day period, and any reference to will mean the first three calendar months of the year, the fourth thro ugh sixth calendar months of the year, the seventh through ni nth calendar months of the year, and the last three calendar months of the year . Whenever the last day for the e xercise of any right or the discharge of any obliga tion hereunder falls on, or any notice is deemed to be g iven on, a Saturday, Sunday, or national holiday, t he Party having such right or obligation will have until 5:0 0 pm PST on the next succeeding business day to exe rcise such right or to discharge such obligation or the Party giving notice will be deemed to have given notice o n the next succeeding business day . No usage of trade, course of performance, or other regular practice between t he Parties hereto may be used to interpret or alter the terms and conditions of this Agreement . Unless otherwise expressly provided in this Agreement, any agreement, instrume nt, or statute defined or referred to means such ag reement, instrument, or statute as from time to time amended, modified, or supplemented, including ( in the case of agreements or instruments ) by waiver or consent and ( in the case of statutes ) by succession of compara ble successor statutes and references to all attachment s thereto and instruments incorporated therein . The Parties have participated jointly in the negotiation and dr afting of this Agreement . If an ambiguity or questi on of intent or interpretation arises, this Agreement will be co nstrued as if drafted jointly by the Parties and no presumption or burden of proof will arise favoring or disfavori ng any Party because of the authorship of any provi sion of this Agreement