What is the Year 2038 problem?

32-bit Unix timestamps can only store values up to 2,147,483,647, which corresponds to January 19, 2038. After this date, 32-bit systems will overflow. Modern 64-bit systems handle timestamps far into the future.

How do I get the current Unix timestamp in JavaScript?

Use Math.floor(Date.now() / 1000) for seconds, or Date.now() for milliseconds. In other languages: Python uses time.time(), PHP uses time(), and SQL uses UNIX_TIMESTAMP().

🕐 Unix Timestamp Converter

Q: What is a Unix timestamp?

A Unix timestamp (epoch time) is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. It is a timezone-independent integer used across programming languages, databases, and APIs to represent a specific moment in time.

Convert between Unix epoch timestamps and human-readable dates. Runs entirely in your browser.

Current Unix Timestamp

Timestamp → Date

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Date → Timestamp

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What is a Unix Timestamp (Epoch Time) and How Does It Work?

A Unix timestamp (also called epoch time, POSIX time, or seconds since epoch) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — a moment known as the Unix epoch. It's a universal, timezone-independent way to represent a specific point in time as a single integer, used across virtually all programming languages, operating systems, databases, and APIs.

Why Developers Use Unix Timestamps Instead of Date Strings

Timezone-independent — A Unix timestamp represents the same absolute moment worldwide, avoiding timezone conversion bugs
Easy to compare — Simple integer comparison (if (ts1 > ts2)) instead of complex date parsing
Storage-efficient — A 32-bit or 64-bit integer uses far less space than a formatted date string
Language-agnostic — Every language can create and parse Unix timestamps: JavaScript (Date.now()/1000), Python (time.time()), PHP (time()), SQL (UNIX_TIMESTAMP())

Common Timestamp Formats: Seconds vs Milliseconds

Unix timestamp (seconds) — 10 digits, e.g. 1700000000. Used by most server-side languages, Unix/Linux commands, and databases.
JavaScript timestamp (milliseconds) — 13 digits, e.g. 1700000000000. Returned by Date.now() and new Date().getTime() in JavaScript.
ISO 8601 — Human-readable format like 2023-11-14T22:13:20Z. Used in JSON APIs and REST responses.

The Year 2038 Problem (Y2K38)

32-bit Unix timestamps can only store values up to 2,147,483,647 (January 19, 2038, 03:14:07 UTC). After this, 32-bit systems will overflow. Modern 64-bit systems store timestamps that extend billions of years into the future. If you work with legacy systems, the Y2038 problem is a real concern for date handling.

Where You'll Encounter Unix Timestamps

Database records — created_at and updated_at columns in PostgreSQL, MySQL, MongoDB
JWT tokens — exp, iat, and nbf claims store expiry and issuance times as epoch seconds
API responses — Stripe, GitHub, Slack, and many APIs return timestamps as epoch integers
Server logs — Application logs, syslog, and access logs often use epoch timestamps for sorting
Cron jobs and schedulers — Task schedulers store next run times as Unix timestamps