Calculating a Notice Period End Date

The unit is the whole question

Thirty working days, thirty calendar days and one calendar month can all be described loosely as "a month's notice", and they end on three different dates. Thirty working days from a Monday is about six weeks later; thirty calendar days is just over four; one calendar month is four to four-and-a-half depending on the month.

Before doing any arithmetic, find the exact wording in the contract or the applicable statutory minimum. If the wording is ambiguous, that ambiguity is the issue to resolve — not something a calculator can settle.

Use this guide with the right tool: Open the Notice Period End Date Calculator for the end date of a notice period counted in working days. If the question shifts, compare it with the Business Date Shift Calculator or the Probation Period End Calculator.

When the clock starts

The second common dispute is the start point. Notice may run from the date it was served, from the following day, from receipt rather than sending, or from the next pay period. Each shifts the end date, and "from receipt" introduces a further question about what counts as receipt for email or post.

Record the date and, where relevant, the time and method of service. If notice is given late on a Friday by email, the difference between "served Friday" and "received Monday" is a full weekend at the far end of the period.

Statutory minimums and contractual terms

Many jurisdictions set a statutory minimum notice period that scales with length of service, and contracts may specify longer. Where they conflict, the more favourable term for the employee usually applies — but the specific rule depends on jurisdiction and employment type.

This is exactly the boundary where a calculator stops being the right tool. Use it to compute the date once you know the rule; use an employment lawyer, HR professional or the relevant labour authority to determine which rule applies.

Holidays, leave and garden leave

A working-day notice period needs a holiday calendar, since public holidays are not working days. Select the jurisdiction in the calculator and the end date accounts for them, reporting how many holidays were skipped. Annual leave taken during notice generally does not extend the period unless the contract says so, but the treatment of accrued untaken leave at termination is a separate question with its own rules.

Garden leave, where the employee remains employed but does not attend, runs on the same calendar as ordinary notice. The end date is unchanged; only the working arrangement differs.

Worked example

None of this is difficult arithmetic. The part worth slowing down for is deciding which convention applies before you start.

Common mistakes to avoid

• Assuming days means working days. Contracts use both. Read the wording before calculating.
• Not recording the service date and method. The start point determines the end point, and 'served' and 'received' can differ by days.
• Ignoring public holidays in a working-day count. They are not working days. Select the jurisdiction so the calculator applies them.

Use the right calculator

The calculators below apply exactly the method described here, with the assumptions visible on the page.

Finance & ProfessionalNotice Period End Date Calculatorthe end date of a notice period counted in working days

Date LabBusiness Date Shift Calculatora date moved forward or backward by weekdays

Finance & ProfessionalProbation Period End Calculatorthe calendar end date of a probation period expressed in months

Frequently asked questions