The Planning Board  will continue its public hearing  from November  on the proposed new town zoning code on Monday.  At the hearing, which begins at 7 p.m., the board will discuss the longstanding plans to overhaul the town’s zoning bylaws — a discussion that has been ongoing since 2009.  Originally, the town had planned to hold a Special Town Meeting  regarding the issue this February,  but continued dialogue has pushed back those plans until this June  at the earliest. The board will also be discussing the bylaws with the Metropolitan Area Planning Council  at Monday’s meeting. The meeting will take place in the Townhouse hearing room, 17 Common St.