---
title: zero
framework: coremedia
role: symbol
role_heading: Type Property
path: coremedia/cmtime/zero
---

# zero

A value that represents time zero.

## Declaration

```swift
static let zero: CMTime
```

## Discussion

Discussion Don’t test a time against this constant using (time == zero) because there are many times that are also 0. Use CMTimeCompare(_:_:) instead.

## See Also

### Constants

- [invalid](coremedia/cmtime/invalid.md)
- [indefinite](coremedia/cmtime/indefinite.md)
- [negativeInfinity](coremedia/cmtime/negativeinfinity.md)
- [positiveInfinity](coremedia/cmtime/positiveinfinity.md)