---
title: kCMTimeRangeStartKey
framework: Core Media
role: symbol
role_heading: Global Variable
platforms: [iOS 4.0+, iPadOS 4.0+, Mac Catalyst 13.1+, macOS 10.7+, tvOS 9.0+, visionOS 1.0+, watchOS 6.0+]
path: coremedia/kcmtimerangestartkey
---

# kCMTimeRangeStartKey

The key for the start field of a time range.

## Declaration

```swift
let kCMTimeRangeStartKey: CFString
```

## See Also

### Constants

- [kCMTimeRangeDurationKey](coremedia/kcmtimerangedurationkey.md)