Unix Timestamp Converter

Unix Timestamp Converter: Seconds to Date and Back

Enter a numeric unix timestamp above to see the corresponding human-readable date and time in both UTC and your local time zone. Or enter a date and time to get the unix timestamp equivalent. This unix timestamp converter handles seconds (10-digit), milliseconds (13-digit), and microseconds (16-digit) formats automatically, detecting the precision from the input length so you never need to manually divide or multiply to normalize between the conventions different platforms use.

What Is a Unix Timestamp?

A unix timestamp is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC - a moment called the Unix epoch. Right now, the current unix timestamp is a 10-digit number in the billions. This single integer representation eliminates every source of date/time confusion that plagues human-readable formats: no time zone ambiguity (is 3 PM Eastern or Pacific?), no daylight saving complications (did the clock spring forward?), no date format disagreements (is 03/04/2025 March 4th or April 3rd?), and no calendar system differences. Two computers exchanging a timestamp unix time value will always agree on the exact moment being referenced, regardless of their local configuration or language settings.

Convert Unix Timestamp to Date

Paste a value like 1714521600 and the tool shows it represents May 1, 2024, 00:00:00 UTC instantly. The unix timestamp to date conversion applies your browser's time zone offset to display the local equivalent alongside the UTC value. This dual display matters because a timestamp recorded in a server log (always UTC) represents a different clock time depending on whether the viewer is in New York (UTC-5), London (UTC+0), or Tokyo (UTC+9). Seeing both times side by side eliminates the mental arithmetic that causes scheduling errors and incident timeline confusion in distributed teams.

Convert Time to Unix Timestamp

Enter a date like "2025-06-15 09:30:00" and the tool returns the corresponding epoch unix timestamp in seconds. Use this direction when you need to set expiration times in JWT tokens, schedule cron jobs relative to a specific moment, filter database records by time range, or pass date values through APIs that expect integer timestamps. The tool also shows the millisecond equivalent for JavaScript environments (Date.now() returns milliseconds) and the ISO 8601 formatted string for APIs that accept text-based date formats. Having all three representations from a single date entry saves the context-switching between converter tools that different systems demand.

Unix Timestamp Milliseconds vs Seconds

The most common conversion error is confusing seconds and milliseconds. Standard Unix timestamps are 10 digits (seconds since epoch). JavaScript's Date.now(), Java's System.currentTimeMillis(), and many modern APIs return 13-digit unix timestamp milliseconds. If you paste a 13-digit value into a converter expecting seconds, the result points to a date 30,000+ years in the future - an obvious error, but one that wastes debugging time in production when a misconfigured function writes the wrong precision to a database. This tool detects the format automatically: 10 digits means seconds, 13 means milliseconds, 16 means microseconds. The output shows the value in all three precisions so you can copy whichever format your target system expects.

The Year 2038 Problem

Systems storing Unix timestamps as 32-bit signed integers will overflow on January 19, 2038, at 03:14:07 UTC. The maximum value of a signed 32-bit integer (2,147,483,647) corresponds to that exact moment. After overflow, affected systems interpret dates as December 13, 1901, causing crashes, data corruption, and security vulnerabilities (expired certificates suddenly appear valid). Modern 64-bit systems use 64-bit timestamps that will not overflow for 292 billion years. However, embedded systems (IoT devices, industrial controllers, automotive computers), legacy databases (older MySQL TIMESTAMP columns), file format specifications (FAT32, some ZIP formats), and firmware in long-lived infrastructure still use 32-bit storage. If you maintain any system with 32-bit timestamp fields, the 2038 deadline is an engineering concern that requires migration planning now, not in 2037.

Time Zones, UTC, and Storage Best Practices

Unix timestamps are UTC by definition. When the converter displays a local time, it applies your browser's time zone offset. The critical best practice: always store timestamps in UTC and convert to local time only for display. Storing local times in databases creates compounding bugs as applications grow: users who travel see incorrect times, daylight saving transitions produce duplicate or missing hours (the hour from 1:00 to 1:59 AM repeats in fall and disappears in spring), and multi-timezone applications cannot determine the original moment from a stored local time without also storing the time zone offset. UTC storage with display-time conversion avoids all of these problems by separating the universal moment from its local representation.

Unix Timestamp in Programming Languages

JavaScript: Math.floor(Date.now() / 1000) for seconds, Date.now() for milliseconds. Python: import time; int(time.time()). PHP: time(). Ruby: Time.now.to_i. Java: System.currentTimeMillis() / 1000. Go: time.Now().Unix(). Bash: date +%s. SQL (PostgreSQL): EXTRACT(EPOCH FROM NOW()). SQL (MySQL): UNIX_TIMESTAMP(). Each language provides a native function because the epoch timestamp is the universal interchange format for time data across systems, APIs, databases, and log files. Converting from a timestamp to a human-readable date uses equally standard functions: new Date(ts * 1000) in JavaScript, datetime.fromtimestamp(ts) in Python, and FROM_UNIXTIME(ts) in MySQL.

Frequently asked questions