| part of the time axis limited by two instants|
NOTE 1 A time interval comprises all instants between the two limiting instants and, unless otherwise stated, the limiting instants themselves.
NOTE 2 A time interval can be specified by the dates marking the initial instant and final instant or by one of these dates and the duration of the time interval.
NOTE 3 For the term “time interval”, the word “time” is often used, but is not recommended in this sense. The expression “time interval” is often used in the sense of “duration” (113-01-13) but this usage is deprecated to avoid confusion.