---
title: CMTimeEpoch
framework: coremedia
role: symbol
role_heading: Type Alias
path: coremedia/cmtimeepoch
---

# CMTimeEpoch

An epoch for a time.

## Declaration

```swift
typealias CMTimeEpoch = Int64
```

## Discussion

Discussion The epoch is typically 0, but you can use a different value — for example to denote a particular iteration of a loop.

## See Also

### Data Types

- [CMTime](coremedia/cmtime.md)
- [CMTimeValue](coremedia/cmtimevalue.md)
- [CMTimeScale](coremedia/cmtimescale.md)
- [CMTimeFlags](coremedia/cmtimeflags.md)