---
title: Pre-Specified Time Ranges
framework: Core Media
role: collectionGroup
role_heading: API Collection
path: coremedia/pre-specified-time-ranges
---

# Pre-Specified Time Ranges

Constants that specify zero and invalid time ranges.

## Topics

### Constants

- [zero](coremedia/cmtimerange/zero.md)
- [invalid](coremedia/cmtimerange/invalid.md)

## See Also

### Constants

- [Dictionary Keys](coremedia/cmtimerange-dictionary-keys.md)