Time of Day
152684·updated May 18, 2026No definition recorded.
Composition
Source
or other attributes by account, type of account, or a combination of both. Other attributes required for authorizing access include restrictions on the time of day, day of the week, and point of origin. When defining otherthe sentence this term was read in
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An environmental or contextual attribute — specifically the clock hour at which an access request occurs — used as one input in an authorization or authentication decision. In attribute-based access control (ABAC) frameworks, NIST SP 800-53 classifies it as an *environmental* attribute, distinct from organizational attributes such as job function or resource attributes such as document classification, that can constrain which system access is permitted. In risk-based and adaptive authentication, NIST SP 800-63 similarly treats it as an environmental signal — alongside IP address, geolocation, and transaction type — evaluated dynamically at the moment of an access or authentication request. In practice, it is paired with related temporal and locational attributes (day of week, point of origin) to form a composite access condition, so that a policy can, for example, permit a session only during business hours or flag a login that falls outside a user's normal usage pattern.
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