Utilities
Unix timestamps to dates and back
Convert Unix timestamps to human dates and dates back to epoch seconds, in your timezone and UTC.
For the best results: Paste epoch seconds or milliseconds (auto-detected by length), any readable date, or the word now. Output covers local time, UTC and ISO 8601.
Runs entirely in your browser, what you paste is never uploaded, logged, or stored.
What is Timestamp Converter?
Timestamp Converter is a free online utility that converts Unix epoch timestamps into readable local and UTC dates, and dates back into epoch time. The conversion runs as plain JavaScript in this tab, so whatever you paste, including anything sensitive, never leaves your device. There is no server call involved at all, no account to make, and no cap on how often you use it.
- ✦Runs entirely in your browser. Nothing you enter is ever uploaded
- ✦No account, no sign-up, and no data leaves your device
- ✦Works offline once the page has loaded
See it in action
A log file shows epoch 0 and a 13-digit millisecond stamp, and both need human dates.
What you type
0, then 1757400000000
What you get
Epoch 0 correctly reads as 1970-01-01 00:00:00 UTC (the Unix epoch itself), and the 13-digit value is auto-detected as milliseconds. Local time, UTC and ISO 8601 all shown.
Tip: Any all-digit input is treated as an epoch: up to 11 digits as seconds, 12 or 13 as milliseconds, so short values like 0 or 86400 behave correctly. Type "now" for the current moment in every format.
Use cases
What people use it for
Decode the Unix timestamps in server logs or API responses into dates you can actually read.
Convert a deadline or event date into epoch time for a database field or API call.
Work out what local time a UTC timestamp from an overseas system actually refers to.
Who uses Timestamp Converter?
Software engineers
decode timestamps buried in logs, tokens, and API payloads while debugging production incidents under time pressure.
Analytics teams
convert epoch columns in data exports into readable dates before building reports, charts, and dashboards.
Support engineers
match customer-reported incident times against server logs that are recorded in UTC epoch seconds.
How it works
- 1Vary step 1 by tool shape using the existing FORM_TOOL_IDS set in app/(public)/[category]/[tool]/page.tsx. Form tools get "Set the options for what you need." and text tools get "Paste your text into the box." Where a tool's config makes it easy, name its own inputs instead. Steps 2 and 3 stay shared as they are.
- 2Your browser computes the result instantly. Nothing is uploaded anywhere.
- 3Copy the output; the tool keeps working even offline.
Tips for the best results
- Count the digits first: ten means seconds, thirteen means milliseconds.
- Compare log times in UTC and convert to local only at the last step.
- Sanity-check converted dates, because an absurd year usually means a unit mismatch.
- Remember epoch time ignores daylight saving; only the local display shifts.
- Store timestamps as epoch in databases and format them at display time.
FAQ
Frequently asked questions
What exactly is Unix epoch time?
A single number counting the seconds elapsed since midnight UTC on 1 January 1970, known as the epoch. Its charm is having no timezone, no daylight saving, and no formatting ambiguity: one integer identifies one instant everywhere on Earth. That is why databases, logs, and APIs favor it, and why humans need a converter to read it.
My timestamp has 13 digits, so why does it convert strangely?
Ten digits means seconds; thirteen means milliseconds. JavaScript and many APIs emit millisecond timestamps, and feeding one into a seconds-based reading lands you tens of thousands of years into the future. Whenever a converted date comes out absurd, count the digits, and strip the final three to bring a millisecond value back to seconds.
What is the difference between local time and UTC in the results?
UTC is the universal reference clock, unchanged by geography or daylight saving; local time is UTC shifted by your device's timezone offset. The same epoch value therefore reads differently in Sydney and London while describing one identical moment. Seeing both at once stops the classic bug of comparing a UTC log line against a local wall clock.
What is the year 2038 problem?
Systems storing epoch seconds in a signed 32-bit integer run out of room on 19 January 2038, when the count exceeds what 32 bits can hold and wraps around to a negative number, which reads as 1901. Modern 64-bit systems are safe for billions of years, but embedded devices and elderly databases still carry the risk.
Does converting timestamps here expose any of my data?
There is nothing to expose it to. Conversion is pure arithmetic performed by the page itself, with no request ever leaving your browser, so log extracts and incident timelines, which often carry sensitive context, stay entirely on your machine. The converter behaves identically with your connection disabled: no accounts, no history, no retention.
How do I convert a Unix timestamp to a date?
Paste the number into the converter and both a UTC and a local reading appear at once. Behind the scenes it is just calendar arithmetic counted forward from 1 January 1970, deterministic and instant. Going the other way, enter a date and receive the matching epoch value back.
Why do computers count time from 1970?
The date was chosen as a convenient round starting point by the engineers building Unix in the early seventies: recent enough to be relevant, tidy enough to standardize on. It stuck, spread with Unix into nearly every operating system and language, and is now the de facto zero point of computing time.
Is this timestamp tool using AI?
No, and a converter is a good example of why not everything should. Timestamp math has exactly one correct answer, so a deterministic calculation beats any generative approach on speed, accuracy, and privacy: results arrive instantly, are never wrong in creative ways, and are computed without your data traveling anywhere.
Are there any usage limits?
None. Everything is generated locally in your browser, so there is no server cost, no metering, and no daily cap, use it as many times as you like, completely free.
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