Unix Timestamp Converter
Convert epoch timestamps to readable date formats, and translate calendar dates into Unix integers.
Also Try Date Calculator →Convert Unix Epoch to Date
Convert Date to Unix Epoch
The Complete Guide to Unix Epoch Timestamps, The Year 2038 Problem & ISO 8601 Standards
In modern operating systems, cloud microservices, database storage (PostgreSQL, MongoDB, Redis), and security protocols (OAuth 2.0 JWT expiration claims exp), time is tracked as an integer known as the Unix Epoch Timestamp (or POSIX time).
Representing time as a single scalar number eliminates the timezone ambiguity, daylight saving shifts, and localized formatting conventions that complicate calendar dates. The s0lve.it Unix Timestamp Converter provides a real-time ticking epoch clock and bidirectional converter across Local time, UTC, and custom world offsets—running 100% locally in your browser with zero server telemetry.
Unix Epoch Timestamp Scales & Ecosystem Reference
| Unit / Resolution | Digit Length | Example Timestamp | Language & Framework Standards |
|---|---|---|---|
| Seconds (Standard) | 10 digits | 1787644800 |
C/C++ (time_t), Python (time.time()), PHP (time()), Linux kernel, JWT tokens. |
| Milliseconds | 13 digits | 1787644800000 |
JavaScript (Date.now()), Java (System.currentTimeMillis()), Node.js. |
| Microseconds | 16 digits | 1787644800000000 |
C++ std::chrono::microseconds, Python datetime microsecond precision. |
| Nanoseconds | 19 digits | 1787644800000000000 |
Go (time.Now().UnixNano()), Rust (SystemTime::now()), high-frequency trading. |
The Year 2038 Problem (Y2038 Bug) Explained
In 32-bit Unix systems, time is stored as a 32-bit signed integer. The maximum positive value representable in 32 signed bits is 2³¹ − 1 = 2,147,483,647. This maximum integer corresponds to Tuesday, January 19, 2038 at 03:14:07 UTC. On the very next second, the integer overflows into negative territory (-2,147,483,648), causing legacy computer systems to interpret the date as December 13, 1901. Modern 64-bit systems expand timestamp storage to 64 bits (2⁶³ − 1 ≈ 9.22 × 10¹⁸ seconds), providing time stability for over 292 billion years.
Frequently Asked Questions (FAQ)
What is a Unix timestamp and how does epoch time work?
A Unix timestamp is the total number of seconds that have elapsed since Thursday, January 1, 1970 at 00:00:00 UTC (excluding leap seconds). Known as the Unix Epoch, it provides a universal, timezone-agnostic standard for computers, servers, and databases to record timestamps.
How do I convert a Unix epoch timestamp into a human-readable date?
Enter your 10-digit (seconds) or 13-digit (milliseconds) integer into the Epoch to Date input and click Convert. The tool instantly calculates the corresponding ISO 8601 string, UTC/GMT time, and your device's local calendar time.
How do I convert a calendar date in any UTC offset into a Unix timestamp?
In the Date to Epoch section, pick your calendar date and time, choose your desired UTC offset from the dropdown, and click Convert Date. The converter calculates both 10-digit second and 13-digit millisecond values.
Why is my timestamp 13 digits instead of 10 digits?
A 10-digit timestamp represents seconds, while a 13-digit timestamp represents milliseconds. JavaScript (Date.now()) and modern web APIs use 13-digit millisecond timestamps. To convert milliseconds to seconds, divide by 1,000.
What is the Year 2038 Problem (Y2038)?
The Year 2038 problem occurs on January 19, 2038 at 03:14:07 UTC when 32-bit signed integer timestamps exceed 2,147,483,647 and wrap around to negative numbers. Upgrading databases and codebases to 64-bit timestamps permanently resolves the issue.
Are my converted production server logs or timestamps private?
Yes. All conversion logic runs 100% locally in your browser's RAM using client-side JavaScript. No server logs, API tokens, or timestamps are ever transmitted across the internet.
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