Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and dates to Unix timestamps instantly.
How to Convert Unix Timestamps & Dates
Select Conversion Mode
Choose between 'Timestamp → Date' or 'Date → Timestamp' mode depending on your input data.
Enter Timestamp or Date
Type or paste your Unix timestamp (seconds or milliseconds) or pick a date, time, and target timezone.
Instant Formatted Output
Instantly view and copy local date/time, UTC time, ISO 8601 strings, or Unix seconds and milliseconds.
What is a Unix Timestamp?
A Unix timestamp (Epoch time) tracks time as a running total of seconds since the Unix Epoch on January 1st, 1970 at 00:00:00 UTC. It is widely used in operating systems, databases, server logs, REST APIs, and file systems because it provides an absolute, unambiguous reference point that does not depend on timezones or daylight saving changes.
Frequently Asked Questions
What is a Unix Timestamp?
A Unix timestamp (also known as Epoch time or POSIX time) is the total number of seconds (or milliseconds) that have elapsed since Thursday, January 1, 1970 00:00:00 UTC. It provides a universal, timezone-independent point in time.
What is the difference between seconds and milliseconds timestamps?
Unix timestamps in seconds are typically 10 digits long (e.g. 1788361200). JavaScript and web APIs often use millisecond timestamps which are 13 digits long (e.g. 1788361200000). ToolJi automatically detects whether your input is in seconds or milliseconds.
Does changing the timezone change the UTC timestamp?
No! A Unix timestamp represents an exact, universal instant in time. Selecting a timezone only changes how that exact instant is displayed in your local time format, leaving the underlying UTC timestamp unchanged.
What is Unix Epoch Time 0?
Unix Epoch Time 0 represents 0 seconds, which corresponds exactly to January 1, 1970 00:00:00 UTC. Dates before 1970 are represented using negative Unix timestamps.
Is my timestamp data processed on a server?
No! All date formatting, timezone calculations, and timestamp conversions run 100% locally in your web browser. Your inputs are never sent to any server.