Unix Epoch Timestamp Converter
Instant two-way Unix timestamp to date conversion with auto-detect for seconds, milliseconds, microseconds, and nanoseconds. Free, fast, and 100% browser-based.
Global Timezone Matrix (Timestamp Equivalents)
| Region | Time Zone | Offset | Local Converted Time |
|---|
Paste multiple Unix timestamps separated by lines or spaces. Perfect for database dumps and server logs.
On Jan 19, 2038 at 03:14:07 UTC, signed 32-bit Unix clocks exceed 2,147,483,647 seconds and wrap to year 1901.
How to Get Current Unix Epoch Time in Code
// JavaScript / Node.js
// 1. Current Unix timestamp in seconds:
const epochSeconds = Math.floor(Date.now() / 1000);
// 2. Current timestamp in milliseconds:
const epochMs = Date.now();
// 3. Convert timestamp to human date (UTC):
const date = new Date(epochSeconds * 1000).toUTCString();
Complete Reference Guide to Unix Epoch & Timestamps
Unix Epoch Time (frequently referred to as POSIX time, Epoch seconds, or Unix timestamp) is the universal computing standard for measuring time. It records the total count of elapsed seconds since 00:00:00 UTC on Thursday, January 1, 1970, deliberately ignoring leap seconds to ensure uniform arithmetic.
Key Epoch Milestones Reference
| Milestone Event | UTC Date & Time | Timestamp (Seconds) |
|---|---|---|
| Unix Epoch Origin | 1970-01-01 00:00:00 UTC | 0 |
| Y2K (Year 2000) | 2000-01-01 00:00:00 UTC | 946684800 |
| 1 Billion Seconds | 2001-09-09 01:46:40 UTC | 1000000000 |
| 2 Billion Seconds | 2033-05-18 03:33:20 UTC | 2000000000 |
| Y2K38 (32-bit Integer Overflow) | 2038-01-19 03:14:07 UTC | 2147483647 |
Why Do Operating Systems, APIs, and Databases Prefer Epoch Time?
- Universal Format Independence: Eliminates localization confusion like standard string conflicts (e.g. distinguishing
05/03/2026as May 3rd vs March 5th). - Fewer Daylight Saving Time (DST) Surprises: Unix timestamps are tied to Coordinated Universal Time (UTC), so stored times stay unambiguous when clocks jump back or forward. You still need a timezone when displaying local times or scheduling recurring events.
- Compact, Easy-to-Compare Storage: Integer timestamps are small and simple to compare and index in PostgreSQL, MySQL, MongoDB, or Redis, and are lighter than storing datetimes as text strings.
10-Digit vs 13-Digit Timestamps: What is the Difference?
The most common source of confusion in timestamp conversion is length:
- 10-Digit Timestamps: Measure time in seconds. Standard across Linux, Python (
time.time()), PHP (time()), and C/C++. - 13-Digit Timestamps: Measure time in milliseconds. Standard across modern web runtimes, JavaScript (
Date.now()), Java (System.currentTimeMillis()), and browser telemetry.
Frequently Asked Questions (FAQ)
What is the Unix Epoch?
The Unix Epoch is defined as 00:00:00 UTC on Thursday, January 1, 1970. Unix timestamps count the elapsed seconds since this universal reference point, excluding leap seconds.
How does auto-detect identify seconds vs milliseconds?
A standard 10-digit integer represents Unix seconds (e.g. 1793800000). A 13-digit integer represents milliseconds (e.g. 1793800000000). Our tool automatically detects length and evaluates microsecond and nanosecond timestamps accordingly.
What is the Year 2038 Problem (Y2K38)?
On January 19, 2038 at 03:14:07 UTC, 32-bit signed Unix timestamps exceed their maximum integer capacity of 2,147,483,647 and overflow into negative numbers (December 13, 1901). Modern systems fix this by migrating to 64-bit integers.
How do you calculate the difference between two Unix timestamps?
Subtract the smaller timestamp from the larger timestamp. The difference yields total elapsed seconds, which can be divided by 60 for minutes, 3,600 for hours, or 86,400 for total days.