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# CVTime Values

Keys that represent Core Video time values.

## Topics

### Constants

[`kCVZeroTime`](/documentation/CoreVideo/kCVZeroTime)

Zero time or duration. For example, [`CVDisplayLinkGetOutputVideoLatency(_:)`](/documentation/CoreVideo/CVDisplayLinkGetOutputVideoLatency(_:)) returns `kCVZeroTime` for zero video latency.

[`kCVIndefiniteTime`](/documentation/CoreVideo/kCVIndefiniteTime)

An unknown or indefinite time. For example, [`CVDisplayLinkGetNominalOutputVideoRefreshPeriod(_:)`](/documentation/CoreVideo/CVDisplayLinkGetNominalOutputVideoRefreshPeriod(_:)) returns `kCVIndefiniteTime` if the display link specified is not valid.


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