Timestamp Converter
Convert between Unix timestamps and human-readable dates
Current Time
Unix Timestamp → Date
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Date → Unix Timestamp
Seconds
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Milliseconds
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What it does: Convert between Unix timestamps and human-readable dates. This free online tool works entirely in your browser with no installation required.
How to use:
- Type a Unix timestamp into the number field or pick a date from the datetime picker.
- Choose whether your timestamp is in seconds or milliseconds for accurate conversion.
- Read the converted date in your local timezone, UTC, and ISO 8601 format.
Privacy: All processing happens in your browser. No data sent to servers.
Best for: Anyone who needs quick Timestamp Converter without installing software.
What is a Unix Timestamp?
A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since January 1, 1970 at 00:00:00 UTC, also known as the Unix epoch. This simple integer representation of time is used universally in computing because it is timezone-independent and easy to store, compare, and calculate with.
Why Developers Use Timestamps
- Database storage — Timestamps are efficient to store as integers and avoid timezone conversion issues that come with human-readable date strings.
- API communication — Most REST APIs use Unix timestamps for representing dates in JSON responses because they are unambiguous and universally understood.
- Date arithmetic — Adding or subtracting time is simple with timestamps: add 86,400 to skip ahead one day, or subtract 3,600 to go back one hour.
- Logging and auditing — System logs typically record events as timestamps for precise chronological ordering.
- File metadata — Operating systems store file creation, modification, and access times as Unix timestamps.
Common Pitfalls
- Seconds vs. milliseconds — Many systems use seconds, but JavaScript's
Date.now()returns milliseconds. Always verify which unit your system expects or provides. - The Year 2038 Problem — 32-bit systems will overflow on January 19, 2038 when timestamps exceed 2,147,483,647. Most modern systems use 64-bit integers to avoid this.
- Timezone display — While timestamps themselves are timezone-agnostic, the human-readable conversion should always display the timezone for clarity.