Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. See the current Unix timestamp live — essential for APIs, databases, and log analysis.
Current Unix Timestamp
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Unix Timestamp Converter — Convert Timestamps to Dates Online Free: Free Unix Timestamp Converter tool: convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. See current.
How to Convert Timestamps
Timestamp to Date
Enter a Unix timestamp (seconds or milliseconds) and click Convert. The tool detects the format automatically and shows UTC, local time, ISO 8601, and relative time.
Date to Timestamp
Use the date picker to select a date and time, then click Convert to get the Unix timestamp in both seconds and milliseconds. Click either value to copy.
Live Clock
The current Unix timestamp updates in real time at the top. Useful for quick reference when testing APIs or checking log timestamps.
What Is a Unix Timestamp?
A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — a moment known as the Unix Epoch. For example, 1700000000 represents November 14, 2023, at 22:13:20 UTC. This simple integer representation of time is used universally in programming, databases, APIs, and operating systems because it's unambiguous (no time zone confusion), compact (a single number), and easy to do arithmetic with (add 86400 to advance one day).
The choice of January 1, 1970 as the epoch was an engineering decision made by early Unix developers at Bell Labs. It was a recent, round date at the time of Unix's creation in the early 1970s. The system was originally designed with 32-bit signed integers, which can represent dates from December 13, 1901 to January 19, 2038. The "Year 2038 problem" (Y2K38) is the concern that 32-bit systems will overflow on January 19, 2038 — modern systems have largely migrated to 64-bit timestamps, which extend to approximately 292 billion years from now.
Timestamps come in two common precisions: seconds (10 digits in the current era, like 1700000000) and
milliseconds (13 digits, like 1700000000000). JavaScript's Date.now() returns milliseconds,
while Unix command-line tools and many databases use seconds. Our converter auto-detects the format: if the
number has 13+ digits, it's treated as milliseconds; otherwise, as seconds.
Working with timestamps is essential for debugging APIs (API responses often include timestamps), analyzing server logs (most log formats use timestamps), scheduling tasks (cron jobs and delayed queues use epoch time), and synchronizing data across time zones. A timestamp is the same everywhere — 1700000000 represents the same instant whether your server is in Tokyo or New York. Converting it to a local date-time for display is the last step, done in the user's browser or application.
Why Use Our Timestamp Converter?
Live Clock
See the current Unix timestamp updating in real time. Useful for quick reference when testing APIs or checking if a timestamp is current.
Bidirectional
Convert timestamps to dates and dates to timestamps. Supports both seconds and milliseconds precision — the format is auto-detected.
Multiple Formats
See UTC, local time, ISO 8601, and relative time (e.g., "2 hours ago") for any timestamp. Click any value to copy it.
Instant
All conversions happen locally in your browser using JavaScript's Date API. No network requests, no delays, no server processing.
Frequently Asked Questions
32-bit signed integers can store values up to 2,147,483,647. At one second per tick, this overflows on January 19, 2038, at 03:14:07 UTC. After that moment, the timestamp wraps to a large negative number, which would be interpreted as December 1901. Modern 64-bit systems handle this by using 64-bit timestamps, extending the range to approximately 292 billion years.
Count the digits. In the current era (2020s), timestamps in seconds have 10 digits (e.g., 1700000000). Milliseconds have 13 digits (e.g., 1700000000000). Our tool auto-detects: if the number is greater than 10,000,000,000, it's treated as milliseconds. This heuristic works reliably for any date after 1970 and before 2286.
No — Unix timestamps deliberately ignore leap seconds. Each day is assumed to be exactly 86,400 seconds. When a leap second occurs, the timestamp effectively "replays" one second. This design choice keeps timestamp arithmetic simple (adding 86400 always equals one day) at the cost of being slightly out of sync with astronomical time.
Yes — negative timestamps represent dates before January 1, 1970. For example, -86400 is December 31, 1969 (one day before the epoch). Our converter handles negative timestamps correctly, though very large negative values may exceed JavaScript's Date precision.
Timestamps are fundamentally UTC — they represent the same absolute instant worldwide. Our tool shows both UTC and your local timezone (detected from your browser). The ISO 8601 output includes the timezone offset. When sharing timestamps, always use the raw number — it's timezone-independent.