Unix Timestamp Converter
Convert Unix time ↔ date/time. Paste a timestamp (seconds or milliseconds) to decode it, or enter a date/time to generate Unix seconds/ms.
Tip: If results look “off by hours”, check UTC vs Local.
| Field | Value |
|---|
Privacy: runs locally in your browser. No inputs are stored or transmitted.
How it works
Timestamp → Date: interpret as seconds or milliseconds since 1970-01-01 00:00:00 UTC, then display as UTC or local time.
Date → Timestamp: build a date/time in UTC or local time, convert to milliseconds since epoch, then output seconds or milliseconds.
Examples
- 1700000000 (seconds) → date/time
- 1700000000000 (milliseconds) → date/time
- Convert 2026-01-01 00:00:00 to Unix seconds
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) elapsed since 1970-01-01 00:00:00 UTC (the Unix epoch).
- Seconds vs milliseconds: what’s the difference?
Seconds timestamps are 10 digits for modern dates (e.g., 1700000000). Milliseconds timestamps are 13 digits (e.g., 1700000000000). This tool supports both.
- Does this show UTC or local time?
You can choose. UTC is consistent across time zones; local time uses your device/browser time zone.
- Why is my converted date different from another site?
Differences usually come from timezone selection (UTC vs local), or whether the timestamp is interpreted as seconds or milliseconds.
- Are my inputs stored?
No. All calculations run locally in your browser. No data is stored or transmitted.