kalenderlevetid

Kalenderlevetid is a term used to describe the period during which a product remains usable or safe based on calendar time, counted from the date of manufacture or packaging. It denotes the time window in which the product should retain its quality and safety under specified storage conditions, before an expiry, best-before, or use-by date elapses. The concept is relevant in industries where shelf life is governed primarily by calendar time rather than by the amount of use or opening.

The term applies across a range of products, including foods, medicines, cosmetics, and chemicals. In practice, calendarlevetid is established through stability testing and regulatory requirements, and is communicated to consumers through dating marks such as expiry dates, best-before dates, or use-by dates. The clock starts at production or packaging and progresses with real time, provided the product is stored under recommended conditions.

Determination of calendarlevetid involves stability studies under defined storage conditions, sometimes supplemented by accelerated aging tests. Factors that influence the calendar life include temperature, humidity, light exposure, oxygen, pH, and formulation. If a product is stored outside the suggested conditions, its calendar life may be shortened, and the product may need to be withdrawn sooner than the stated date.

Differences from other concepts, such as open-counter shelf life, relate to whether the time limit is tied to calendar time independent of use. Kalenderlevetid is a regulatory and managerial concept intended to ensure safety and quality up to the stated date, with consequences for production planning, retail handling, and consumer guidance. Regulatory practices vary by jurisdiction and product category, and dating requirements are not always uniform.