What is a deemed-receipt rule and why does it matter?

Contracts often say a notice is treated as received a set time after sending — same day for hand delivery, the next business day for email sent in hours, or two to three business days for first-class post. The notice period usually runs from this deemed-receipt date, not the send date, so getting it right can shift the expiry by several days.

How are months added to a date?

Adding calendar months moves to the same day number in the later month — 15 January plus three months is 15 April. When the target month has no matching day (for example 31 January plus one month), the result rolls back to the last day of that month, the convention most contracts and courts follow.

Does the tool count the start day?

By default the clock starts the day after the deemed-receipt date, the common 'clear days' convention in many contracts and procedural rules. You can switch to counting from the receipt day itself if your clause says the period runs from the date of receipt inclusive.

What happens if the expiry falls on a weekend or holiday?

If you enable the business-day convention, an expiry that lands on a Saturday, Sunday, or public holiday rolls forward to the next working day, which many commercial contracts require for service and performance deadlines. Leave it off for a strict calendar-day clause.

Is this jurisdiction-specific?

The arithmetic is general, but deemed-receipt periods and what counts as a business day vary by jurisdiction and by the contract's own definitions. Always read the notices clause and any governing-law provisions; this tool is a planning aid, not legal advice.

Contract Notice Period Calculator

A contract notice period calculator turns a notice-delivery date and a clause-defined period into the exact date the notice expires or takes effect. Getting termination and renewal deadlines right is unforgiving work: a notice served a day late can lock a party into another contract term. This tool adds days, weeks, or months to the date the notice is deemed received, with optional business-day handling.

How it works

The clock rarely starts on the send date. The tool first applies a deemed-receipt rule based on delivery method — same day for hand delivery, the next business day for email, or a fixed number of days for first-class post — to find when the notice is treated as received.

From that receipt date it adds the notice period. Days and weeks are straightforward addition. Months use the calendar convention: add to the same day-of-month in the later month, and if that day does not exist (such as 31 January plus one month), roll back to the last day of the target month.

By default it counts from the day after receipt (the “clear days” convention) and, if you enable the business-day option, rolls any expiry that lands on a weekend or public holiday forward to the next working day.

Expiry = deemed-receipt date + notice period (months snap to month-end where needed), with optional working-day roll-forward.

Example and notes

A clause requires 3 months’ notice. The notice is posted on 14 March with a two-business-day deemed-receipt rule, so receipt is 18 March. Adding three months gives an expiry of 18 June. If 18 June were a Sunday and the working-day option were on, it would roll to Monday 19 June.

Deemed-receipt windows and the definition of a business day are set by the contract and its governing law — always read the notices clause itself. This is a date-arithmetic aid, not legal advice, and all calculation stays in your browser.