# Six months > Six months means a period of 180 consecutive days, recognised either from a specific start date or as half of a calendar year. **Term:** Six months **Last updated:** 2026-07-29 ## Definition ## What six months means in a contract In a contract, six months is a defined duration that marks how long a right, duty, or window lasts. It is usually understood either as half a calendar year or, more precisely, as a run of 180 consecutive days from a named start point. The phrase looks simple, but in a contract it is a load-bearing term. It can fix the length of a notice period, a warranty, a probation, an option to renew, or a deadline for making a claim, and each of those uses turns on knowing exactly when the six months starts and stops. ### How it is defined or measured There is more than one way to count six months, and the difference can matter. Counted as calendar months, six months from the 15th of one month simply ends on the 15th of the sixth month after, regardless of how many days each month holds. Counted as days, it is a flat 180 days. These two methods can land on different dates, especially across months of unequal length. Contracts also have to say whether the start day itself is included, and what happens when the end date falls on a weekend or public holiday. A clause that leaves counting to assumption invites disagreement. ### Where the term appears Fixed periods like six months appear throughout commercial and employment documents. They set warranty and limitation windows, minimum terms, cure periods, and non-compete durations. They are central to notice arrangements, for example in a [notice period notice](https://www.genieai.co/en-us/template-type/notice-period-notice) that tells the other side when an agreement will end. In employment settings the length of required notice is often the whole point of the clause, a subject explored in this guide to the [minimum notice period for ending employment](https://www.genieai.co/blog/whats-the-minimum-notice-period-you-have-to-give-for-ending-employment). Across the [finance](https://www.genieai.co/industry/finance) sector, six-month windows govern reporting cycles, interest periods, and review dates, where a mistaken start date can carry real cost. ### Why the exact wording matters Because the same phrase can be measured in different ways, the precise wording controls the outcome. Whether a party has met a deadline, kept within a limitation window, or given enough notice can all hinge on how the six months is counted. If a contract says "within six months of completion," the parties still need to know whether completion day counts and which counting method applies. Under the law governing the contract, courts will read the term in its context, but leaving that context unclear shifts risk onto whoever needs to rely on the deadline. Defining the method removes the argument before it starts. ### Drafting considerations When drafting, state the start event precisely, for example the effective date, the delivery date, or the date of a notice, rather than a vague reference to "the agreement." Say whether six months means calendar months or 180 days, and whether the first day is included. Add a rule for end dates that fall on a non-business day, and use business days rather than calendar days where the period drives an operational obligation. Where several six-month periods run in the same document, use consistent language so one clause is not read differently from another. Getting the mechanics right turns a familiar phrase into a dependable deadline that every party can calculate the same way. ## Context ### Relevant circumstances - Calculation of Work Experience - Determining payment cycles - Measurement of Performance Metrics - Calculation of Lease or Loan Term - Implementation of a project phase ### Relevant sectors - Finance ## Relevant contract types - [Notice Period Notice](https://www.genieai.co/en-us/template-type/notice-period-notice) --- This is the Markdown representation of [https://www.genieai.co/en-us/define/six-months](https://www.genieai.co/en-us/define/six-months), provided for AI agents and crawlers. The HTML page is canonical. See [/llms.txt](https://www.genieai.co/llms.txt) for the full content map.