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# Time

Defined time values.

## Topics

### Defined Times

[`invalid`](/documentation/CoreMedia/CMTime/invalid)

A value that represents an invalid time.

[`indefinite`](/documentation/CoreMedia/CMTime/indefinite)

A value that represents an indefinite time.

[`positiveInfinity`](/documentation/CoreMedia/CMTime/positiveInfinity)

A value that represents positive infinity.

[`negativeInfinity`](/documentation/CoreMedia/CMTime/negativeInfinity)

A value that represents negative infinity.

[`zero`](/documentation/CoreMedia/CMTime/zero)

A value that represents time zero.


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