Unix Time Converter
Free Unix time Converter for numeral systems units. Enter a value to see equivalent measurements across systems. Free to use with no signup required.
Formula
Unix Timestamp = seconds since January 1, 1970 00:00:00 UTC
Unix time counts the number of seconds elapsed since the Unix epoch (January 1, 1970, 00:00:00 UTC). Positive values represent dates after the epoch, negative values represent dates before it. Millisecond timestamps multiply by 1000 for sub-second precision.
Worked Examples
Example 1: Convert a Specific Timestamp
Problem: What date and time does Unix timestamp 1000000000 represent?
Solution: 1,000,000,000 seconds after Jan 1, 1970 00:00:00 UTC\n= 11,574 days, 1 hour, 46 minutes, 40 seconds\n= September 9, 2001 01:46:40 UTC
Result: Unix 1000000000 = September 9, 2001 01:46:40 UTC
Example 2: Date to Unix Timestamp
Problem: Convert July 20, 1969 (Moon landing) to a Unix timestamp.
Solution: July 20, 1969 20:17:00 UTC is before the epoch\nDifference = -14,182,980 seconds\nNegative timestamps represent dates before Jan 1, 1970
Result: July 20, 1969 20:17:00 UTC = -14182980
Frequently Asked Questions
What is Unix time (epoch time)?
Unix time, also called epoch time or POSIX time, is a system for tracking time as a single number: the count of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC, not counting leap seconds. This date is known as the Unix epoch. For example, a Unix timestamp of 1700000000 represents November 14, 2023 at 22:13:20 UTC. Unix time is widely used in programming, databases, and operating systems because it provides a simple, unambiguous, timezone-independent way to represent a moment in time.
What is the difference between Unix timestamps in seconds and milliseconds?
Standard Unix timestamps count seconds since the epoch and are typically 10 digits long (as of 2024). Millisecond timestamps multiply by 1000 to include fractional seconds, making them 13 digits long. JavaScript uses milliseconds by default with Date.now(), while languages like Python and PHP use seconds. Many APIs and databases accept both formats. This converter automatically detects whether your input is in seconds or milliseconds based on the digit count.
How do time zones affect Unix timestamps?
Unix timestamps are always in UTC and are not affected by time zones. A timestamp of 1700000000 represents the exact same moment worldwide, regardless of the local time zone. When you convert a Unix timestamp to a human-readable date, you must specify which time zone to display it in. This is why Unix timestamps are ideal for storing dates in databases that serve users across different time zones, as the conversion to local time happens at display time.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
Can I use the results for professional or academic purposes?
You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.
Can I use Unix Time Converter on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.