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Time Constraint
Time Constraint  
A time constraint is a type of interval constraint that specifies that one or more model elements must conform to a restriction specified by a time interval. A time constraint is not the time interval itself but a constraint, which associates the interval with one or more elements specifying how it restricts the elements, time semantics.

Explanation

Like any constraint the time constraint is used when the formal semantics of an element are insufficient to express some restriction on the modeled elements. A time interval defines minimum and maximum values defining a range, and this range can be applied to one or more model elements by the use of a time constraint. If the constraint does not evaluate to TRUE in a running system the time interval is considered to be invalid.

Unified Modeling Language and UML are either registered

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