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Unix Timestamp Converter
A Unix timestamp converter turns the raw epoch numbers that appear in server logs, API responses, databases, and crawl exports into readable dates, and turns any human date back into a timestamp. Unix time counts the seconds elapsed since midnight UTC on 1 January 1970, so a value like 1700000000 means nothing on its own until it is converted into a wall-clock date you can actually reason about.
This tool converts in both directions entirely in your browser. Paste a timestamp and it auto-detects seconds versus milliseconds, then shows the UTC time, your local time, ISO 8601, the day of the week, and a relative reading such as “3 days ago”. It is free, needs no sign-up, and sends nothing you type to a server.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
How to use the Unix timestamp converter
Switch between the two directions with the tabs. Paste an epoch value to decode it, or pick a date to encode it, and every field updates the moment you type.
Seconds or milliseconds: the converter detects which you pasted
Most APIs and Unix systems express epoch time in seconds, which is a ten-digit number for any present-day date. JavaScript, Java, and many log formats use milliseconds instead, adding three digits for a thirteen-digit value. Pasting a millisecond timestamp into a seconds field returns a date thousands of years in the future, a classic source of broken reports. This tool reads the digit count, treats anything with thirteen or more digits as milliseconds, labels which unit it assumed, and prints both the seconds and milliseconds form so the value can be reused without manual multiplication.
Read UTC and local time side by side to avoid timezone bugs
An epoch timestamp is a single instant with no timezone attached, so the same number is correct everywhere on Earth. The confusion starts when it is displayed, because a server logging in UTC and an analyst reading in their local zone see different clock times for the identical event. The converter shows the UTC rendering and your browser’s local rendering together, each labelled with its offset, so a log entry stamped at one instant lines up cleanly with the local time a teammate or client would expect to see in a report or audit.
Copy ISO 8601, relative time, and the day of week in one pass
Different tools want the same instant in different shapes. ISO 8601 is the format databases, sitemaps, and structured data expect, relative phrasing like “in 5 hours” is what dashboards and changelogs display, and the day of the week often matters when checking whether a domain expired on a weekend or a crawl ran on a holiday. Rather than reaching for several utilities, this converter outputs all of them from a single input, with a copy button on each line so the exact value lands in the format the next system needs.
Unix timestamp converter frequently asked questions
Q1What is a Unix timestamp?
A Unix timestamp is the number of seconds that have passed since midnight UTC on 1 January 1970, a moment known as the epoch. Because it is a plain count with no timezone attached, it represents the same instant everywhere in the world, which makes it the standard way servers, APIs, and databases store points in time before formatting them for display.
Q2How do I tell seconds from milliseconds?
Count the digits. A present-day timestamp in seconds is ten digits, while the same instant in milliseconds is thirteen digits because three more are added for the fractional second. This converter checks the digit count automatically, treating thirteen or more digits as milliseconds, and labels which unit it assumed so a millisecond value is never misread as a date far in the future.
Q3Does this timestamp converter send my data anywhere?
No. Every conversion runs locally in your browser with client-side JavaScript using the built-in Date functions, and nothing you paste into the timestamp or date fields is uploaded, logged, or stored. Once the page has loaded the tool keeps working offline, which makes it safe for timestamps pulled from private logs, internal systems, or confidential exports.
Q4Why does my local time differ from the UTC result?
Both are correct, because they describe the same instant from two viewpoints. UTC is the global reference clock, while your local time applies your region’s offset and any daylight saving rule. The converter shows both side by side with their offsets so you can match a log entry written in UTC against the wall-clock time a person in your timezone would have seen.
Q5Can it convert a date back into a timestamp?
Yes. Switch to the Date to Timestamp tab, choose a date and time, and pick whether to interpret it as your local time or UTC. The tool returns both the seconds and milliseconds epoch value, plus the matching ISO 8601 string and day of week, so you can move in either direction without juggling a second utility or doing the math by hand.
