About this utility
How to use Batch Timestamp Converter
Convert thousands of Unix seconds, milliseconds, ISO dates, and human-readable timestamps in one local table.
What to provide
Enter one value per line. Numeric values below 100 billion are interpreted as Unix seconds; larger values as milliseconds.
- Paste, type, or drag and drop a supported text file into the input area.
- Review the input and the clearly labeled output behavior.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
What the result means
A sortable conversion table and downloadable CSV with invalid rows retained.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- Everything is processed in this browser tab. Input, filenames, keys, and output are never uploaded or saved. Human-readable strings follow the browser date parser; use an explicit ISO 8601 offset for portable results.
Try the included example
Select “Load example” at any time to restore this tested sample.
0
1710000000
1710000000000
2026-07-24T12:30:00Z
not-a-date