Unix Timestamp Converter
Convert Unix epoch timestamps to readable dates (IST & UTC) or convert any date and time to a Unix timestamp.
Enter values and click Convert to see results
Formula
What Is a Unix Timestamp?
A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. It is widely used in programming, databases, and APIs to store and transmit date-time values as a single integer.
Date → Timestamp: Math.floor(date.getTime() / 1000)
Epoch: January 1, 1970 00:00:00 UTC
The Y2K38 Problem
32-bit systems store timestamps as signed integers, which will overflow on January 19, 2038 at 03:14:07 UTC. This is similar to the Y2K bug. Modern 64-bit systems use 64-bit timestamps, which are safe for billions of years.
Seconds vs Milliseconds
Unix timestamps are traditionally in seconds, but JavaScript's Date.getTime() returns milliseconds. Many APIs use seconds (10 digits like 1700000000) while JavaScript uses milliseconds (13 digits). This tool accepts seconds and also shows the millisecond equivalent.
Related Tools
View dates in multiple formats with the Date Formatter. Convert between time zones using the Time Zone Converter.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp is the number of seconds elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). It is widely used in programming and databases to store date/time values.
Is this calculator free, and do I need to sign up?
Yes, it is completely free with no sign-up. There are no usage limits and no paywalls.
Are my inputs saved or sent to any server?
No. Every calculation happens entirely in your browser. Nothing you type is uploaded, logged, or shared with us or any third party.