Short answer. You must file on the next working day. Rule 22 of the Rules of Court provides that when the last day of a period falls on a Saturday, a Sunday, or a legal holiday in the place where the court sits, the time does not run until the next working day.
What the law says
the day of the act or event from which the designated period of time begins to run is to be excluded and the date of performance included
Rule 22, Section 1 — How to compute time. Read the full provision →
What the law says
If the last day of the period, as thus computed, falls on a Saturday, a Sunday, or a legal holiday in the place where the court sits, the time shall not run until the next working day.
Rule 22, Section 1 — How to compute time. Read the full provision →
How the count starts
Rule 22, Section 1 sets out the whole arithmetic of court deadlines: the day of the act or event from which the designated period of time begins to run is to be excluded and the date of performance included. If you receive a decision on 1 March and have fifteen days to act, 1 March itself does not count; the count begins on 2 March, and the fifteenth day — the date of performance — is the last day to file. This computation applies to periods fixed by the Rules, by order of the court, or by any applicable statute.
The weekend and holiday rule
The section then answers the question directly: If the last day of the period, as thus computed, falls on a Saturday, a Sunday, or a legal holiday in the place where the court sits, the time shall not run until the next working day. Only the last day triggers the extension. Weekends and holidays that fall in the middle of the period are counted like any other day; they do not stretch the deadline. And the deadline moves to the next working day — not merely the next calendar day.
The holiday must be where the court sits
Notice the qualifier: the holiday must be a legal holiday in the place where the court sits. A non-working day declared only for your own city or province does not move a deadline in a court sitting elsewhere — and the reverse is also true, since a local holiday in the court's own city can extend your period even if it is an ordinary working day where you are. When a deadline lands near a local or newly proclaimed holiday, confirm the status of that specific day in the court's location before assuming you have gained a day.
Use the rule as a safety net, not a plan
The extension operates automatically — you do not need to ask the court for it — but it is a narrow mercy. It does nothing for a deadline that falls on an ordinary working day, and it cannot repair a count that started from the wrong date. The most common error is mistaking the trigger: periods generally run from receipt of the order or judgment, not from its date. Keep the envelope, the registry return card, or the electronic notice that proves when you received it; that document fixes day one, and everything else is arithmetic.