Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
What is Unix Timestamp Converter?
The Unix timestamp converter handles seconds-since-epoch (Jan 1, 1970 UTC) and human-readable date conversions. Used in databases, APIs, and log files.
Formula
Unix timestamp = seconds since 1970-01-01 00:00:00 UTC. Multiply by 1000 for milliseconds.
Worked example
1735689600 = 2025-01-01 00:00:00 UTC. 1735689600000 (with ms) = same date/time.
How to use this calculator
- Enter timestamp or date.
- Pick conversion direction.
- All representations appear.
Frequently asked questions
Is the Unix timestamp Y2038 safe?
32-bit signed Unix timestamps overflow on 2038-01-19 03:14:07 UTC. Modern systems use 64-bit timestamps that won't overflow until ~292 billion years from now. Most issues remaining are in legacy systems or embedded firmware.
Why so many systems use Unix time?
Single number, no time zones, no DST issues, integer-based math. Universal across operating systems. JavaScript, Java, Python, Go, Rust — all use it natively.
Seconds vs milliseconds?
JavaScript uses milliseconds. Database column conventions vary — Postgres stores as bigint seconds; MongoDB as ms. Always check the system you're using.
What about local time vs UTC?
Unix timestamps are always UTC. To display in local time, convert from UTC to user's zone. Storing local time directly is a recipe for bugs.