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

Frequently Asked Questions

Enter a Unix timestamp (seconds or milliseconds since epoch) to convert it to a human-readable date, or enter a date to get the corresponding Unix timestamp. The tool uses JavaScript's Date object for conversions. Everything runs in your browser — no data is sent to any server.

Unix timestamps in seconds are 10 digits (e.g., 1700000000) and are used by most programming languages and APIs. Millisecond timestamps are 13 digits (e.g., 1700000000000) and are used by JavaScript's Date.now(), Java's System.currentTimeMillis(), and some APIs. This tool auto-detects and handles both formats.

The Unix epoch (January 1, 1970 00:00:00 UTC) was chosen as a convenient reference point when Unix was developed at Bell Labs in the early 1970s. All Unix timestamps represent the number of seconds elapsed since this date, providing a simple, timezone-independent way to represent time across systems.

Unix timestamps are always in UTC — they represent a universal point in time regardless of timezone. When displaying a timestamp, you convert it to a local timezone for the user. This tool shows both UTC and your local timezone. In code, use libraries like Intl.DateTimeFormat (JavaScript) or pytz (Python) for timezone conversions.

Yes. All timestamp conversions are performed entirely in your browser using JavaScript's built-in Date object. No timestamps or dates are sent to any server or stored anywhere. You can safely convert timestamps from production logs, API responses, or internal systems.

Unix Timestamp Converter

Timestamp → Date

Date → Timestamp

Related Tools

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

Why Developers Use Unix Timestamps Instead of Date Strings

Common Timestamp Formats: Seconds vs Milliseconds

The Year 2038 Problem (Y2K38)

Where You'll Encounter Unix Timestamps

Frequently Asked Questions

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