convert unix timestamp to date

Convert Unix timestamp to date

Unix timestamps appear in logs, APIs, databases and HTTP headers. Being able to quickly convert between epoch and human-readable date is indispensable for debugging and system analysis.

Unix → Date

Unix timestamp

Date → Unix

Date / ISO string

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Seconds or milliseconds?

Original Unix timestamps count seconds since 1970-01-01T00:00:00Z. Modern languages (JavaScript Date, Java Instant.toEpochMilli()) use milliseconds. The heuristic: values above 1×10¹² are likely milliseconds; below, seconds.

Timestamp examples

Epoch zero

Input: 0
Expected output: 1970-01-01T00:00:00.000Z

The beginning of Unix time — midnight on 1 January 1970 UTC.

Current timestamp (example)

Input: 1700000000
Expected output: 2023-11-14T22:13:20.000Z

Use the tool with "now" to get the current timestamp.

Full tool FAQ

What is a Unix timestamp?

It is the number of seconds (or milliseconds in JavaScript) elapsed since 1 January 1970 at 00:00:00 UTC. Also called Epoch time or POSIX time, it is the universal format for representing time instants in computing systems.

How do I distinguish seconds from milliseconds in a timestamp?

Why does the displayed time differ from my local time?

What is the maximum representable Unix timestamp?

Why does JavaScript use milliseconds instead of seconds?

What is ISO 8601?

When should I use a timestamp versus an ISO string?

How far back and forward can this converter handle?

Frequently asked questions

What is the Y2K38 problem?

Systems that store Unix timestamps in signed 32-bit integers will reach their maximum value on 19 January 2038 at 03:14:07 UTC. Modern systems use int64 and are not affected, but legacy embedded systems may be.

Does this page replace official or professional review?

No. It helps explain the scenario and use the tool more safely, but real decisions should consider official sources, full context and qualified guidance when needed.