---
title: Modification date
framework: QuickTime File Format
role: symbol
role_heading: Data field
path: quicktime-file-format/preview_atom/modification_date
---

# Modification date

A 32-bit unsigned integer containing a date that indicates when the preview was last updated.

## Overview

Overview The data is in standard Macintosh format.

## See Also

### Atom fields

- [Size](quicktime-file-format/preview_atom/size.md)
- [Type](quicktime-file-format/preview_atom/type.md)
- [Version number](quicktime-file-format/preview_atom/version_number.md)
- [Atom type](quicktime-file-format/preview_atom/atom_type.md)
- [Atom index](quicktime-file-format/preview_atom/atom_index.md)