Timestamp Converter
Convert between Unix timestamps and human-readable dates.
What's a Unix Timestamp?
It's a plain number that counts seconds since January 1, 1970, 00:00:00 UTC. That starting point is called the "Unix epoch." Every second that passes, the number goes up by one. So timestamp 1700000000 translates to November 14, 2023 at 22:13:20 UTC. Simple, but incredibly useful for storing dates in code.
Why Developers Use Timestamps
- They're timezone-independent - always based on UTC, so no confusion across regions
- Easy to compare - just compare two numbers to find which came first
- No date format ambiguity - no more wondering if 01/02/2024 means January 2nd or February 1st
- Universal across every programming language and database system
- Simple math - finding the difference between two dates is just subtraction
Seconds vs. Milliseconds
This trips people up constantly. Standard Unix timestamps are 10 digits (seconds). JavaScript's Date object uses 13 digits (milliseconds). If your converted date shows something in January 1970, you're probably passing seconds where milliseconds are expected - multiply by 1000. This tool auto-detects the format based on digit count.
The Year 2038 Problem
Systems that store timestamps in a 32-bit signed integer will overflow on January 19, 2038 at 03:14:07 UTC. That's when the counter hits 2,147,483,647 and rolls over. It's basically the Y2K bug for Unix time. Most modern systems already use 64-bit timestamps, but some older embedded systems and legacy code could still have issues.
Quick Conversion Commands
Need to convert in your terminal? On Linux or Mac, run date -d @1700000000. In Python, use datetime.utcfromtimestamp(1700000000). In JavaScript, new Date(1700000000 * 1000) gets you there. Each language handles it slightly differently, which is why having a web-based converter handy saves time.
How to Use
- Enter a Unix timestamp to see the human-readable date.
- Or enter a date to get its Unix timestamp.
- Results show in UTC, your local timezone and ISO 8601 format.
- Copy whichever format you need.
Frequently Asked Questions
What is the current Unix timestamp?
The current timestamp is shown live at the top of the tool. It updates every second. You can also get it in most terminals by running "date +%s" on Linux/Mac.
My timestamp converts to a date in 1970. What's wrong?
You're probably mixing up seconds and milliseconds. If your timestamp has 13 digits, it's in milliseconds (common in JavaScript and Java). If it has 10 digits, it's in seconds. Divide by 1000 or multiply by 1000 depending on which direction you're going.
Are Unix timestamps affected by timezones?
Timestamps are always UTC. The timezone only enters the picture when you convert to a readable date and choose how to display it - the underlying number is identical in Tokyo and New York.
Do Unix timestamps account for leap seconds?
Unix time ignores them - every day is exactly 86,400 seconds. That keeps the math simple at the cost of drifting a second or two from atomic clocks. For practically every application, the difference never matters.
What happens when the 2038 problem hits?
Systems using 32-bit signed integers for timestamps will overflow on January 19, 2038. The counter maxes out at 2,147,483,647 and wraps around. Most modern systems already use 64-bit timestamps that won't overflow for another 292 billion years.