Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Runs entirely in your browser.
Timestamp → Date
Date → Timestamp
How to Use Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Live clock, seconds and milliseconds. 100% client-side.
Type directly into the input field, paste from your clipboard, or upload a file. The tool accepts a wide range of inputs and handles edge cases automatically.
Click the action button or watch as the tool processes your input in real time. All computation happens locally in your browser - nothing is sent to any server.
Copy the output to your clipboard with one click, or download it as a file. Your data stays private throughout the entire process.
Why Choose PrivConvert?
Unlike other online tools that upload your files to remote servers, store them for days, and may use them for AI training or data mining, PrivConvert was built with privacy as the foundation.
Files are processed in volatile memory (RAM) and immediately purged. Nothing is ever written to disk or backed up.
All uploads and downloads are encrypted with TLS 1.3. Your files cannot be intercepted in transit.
Use any tool instantly without signing up, providing an email, or creating a profile. No tracking cookies, no user profiling.
Compatible with Windows, macOS, Linux, iOS, and Android. No plugins or desktop software needed - just a modern web browser.
Trusted by Thousands of Users
PrivConvert processes thousands of file conversions every day. Our commitment to privacy and security has made us the go-to choice for professionals, developers, and privacy-conscious users worldwide.
Frequently Asked Questions
Is Unix Timestamp Converter free to use?
Yes, completely free with no limits, no sign-up, and no hidden fees. Use it as many times as you want.
Is my data safe?
All processing happens directly in your browser. Your data is never sent to any server, never stored, and never shared. It's 100% client-side.
Does it work on mobile devices?
Yes. The tool works on any device with a modern web browser - smartphones, tablets, laptops, and desktops.
Do I need to create an account?
No. You can use the tool instantly without signing up, providing an email, or creating any profile.
Seconds, milliseconds, and the timezone that is not there
A Unix timestamp counts seconds since 1 January 1970 UTC. It is a single number with no timezone, no daylight saving and no locale — which is exactly why systems store time this way and why the number is meaningless until you decide what to render it in.
Ten digits or thirteen
The most common mistake is a factor of a thousand. Unix tools and most
databases use seconds, giving a 10-digit number for current
dates. JavaScript's Date.now() and most JVM APIs use
milliseconds, giving 13 digits. Feed milliseconds to something
expecting seconds and you land some 50,000 years in the future; the reverse puts
you in January 1970. If a date is wildly wrong in one of those two directions,
this is almost always why.
The 2038 problem
A signed 32-bit integer overflows on 19 January 2038, wrapping to 1901. Modern systems use 64-bit time and are unaffected, but embedded devices, old database columns and file formats with a fixed 32-bit field still exist. Anything computing dates far into the future — mortgage terms, certificate expiry, pension dates — can hit it today rather than in 2038.
Leap seconds
Unix time pretends they do not exist: a day is always exactly 86,400 seconds. When a leap second is inserted, the counter repeats a value rather than advancing. This is a deliberate simplification and the reason Unix timestamps are not suitable for measuring precise elapsed intervals — use a monotonic clock for that.
Conversion runs in your browser using its own date handling, so your local timezone is applied locally and nothing is sent anywhere.