alldayfalse

alldayfalse is a term encountered in software development and calendar data modeling. It denotes that a calendar event is not an all-day event, and is typically represented as a boolean flag in code or documentation.

Origin and usage: The phrase combines 'all day' with 'false' to illustrate a non-all-day status in sample objects and API docs. It is not a formal standard. In many calendar schemas, the all-day status is indicated by either date-only values or by a boolean field such as isAllDay that can be true or false.

Practical notes: Although formal specifications such as iCalendar do not define a field named alldayfalse, developers often use identifiers like allday, isAllDay, or similar to represent the concept. The value false signals that the event has a specific start and end time rather than lasting throughout the day.

Example: In JavaScript, an event object might include start and end times with an allday property set to false, such as: start: '2025-12-08T09:00:00', end: '2025-12-08T10:00:00', allday: false.

See also: All-day event, Calendar API, Boolean data type.