(a) Computation. - In computing any period of time prescribed or allowed by these rules, by order of court, or by any applicable statute, including rules, orders or statutes respecting publication of notices, the day of the act, event, default or publication after which the designated period of time begins to run is not to be included. The last day of the period so computed is to be included, unless it is a Saturday, Sunday or a legal holiday when the courthouse is closed for transactions, in which