File Timestamp Editor
Rewrite the timestamps stored inside a ZIP, DOCX, XLSX or PPTX archive.
Files & batch Client-side ZIP central-directory and local-header patching
Tool preview
How to use it
- 01
Drop a ZIP-based file.
- 02
Review the timestamps it currently carries.
- 03
Pick a new date and download the rewritten copy.
Limitations
- ! The modification time of a file on disk belongs to the operating system and cannot be changed from a browser.
- ! Inside the archive, every entry gets the same timestamp.
- ! Dates before 1980 cannot be represented by the ZIP format.
FAQ
Why can a browser not change the file date?
The File API is read-only for security reasons. What this tool can do is rewrite the dates that live inside the container, which is what Office shows in its properties panel.
Which formats work?
Any ZIP container: .zip, .docx, .xlsx, .pptx, .odt, .ods and .odp.
Is the file uploaded?
No, the bytes are patched in this tab.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- ZIP central-directory and local-header patching
- Category
- Files & batch
- Network requests
- None while processing