Convert Unix timestamps to human-readable dates, or any date to a Unix timestamp. Supports UTC and local time.
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A Unix timestamp is the number of seconds elapsed since 1 January 1970 at 00:00:00 UTC. It is the most common way to represent time in computer systems because it is timezone-independent, unambiguous, and easy to do arithmetic with. Our converter instantly translates timestamps to readable dates and vice versa.
Unix timestamps in seconds have 10 digits. Timestamps in milliseconds have 13 digits. JavaScript uses milliseconds by default. Python and most server-side languages use seconds by default. If your conversion result looks wrong, check whether your input is in seconds or milliseconds.
Unix timestamps are always in UTC. When converting to a human-readable date, the result changes depending on the timezone offset. The same timestamp shows as different local times in Islamabad, London, and New York. Always specify the timezone when displaying timestamps to users to avoid confusion.
One of the most common sources of bugs in software applications is incorrect time zone handling. A Unix timestamp is always in UTC representing a specific moment in time unambiguously. The error occurs when converting to a local time for display without specifying the time zone explicitly. The same Unix timestamp displays as completely different local times in Islamabad, London, and New York. Always store timestamps in UTC and convert to local time only at the point of display using the user's time zone preference rather than the server's time zone setting.
Unix timestamps count seconds from January 1, 1970. However, not all systems use the same epoch or unit. JavaScript uses milliseconds since the Unix Epoch which is 1000 times larger than a standard Unix timestamp. Windows file system timestamps use a different starting epoch. GPS time started from a different reference date. When integrating data from different systems, always verify which epoch and unit each timestamp uses before performing calculations or comparisons to avoid errors that can be very difficult to debug.
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