The Timestamp Converter converts Unix timestamps to human-readable dates and times, and converts dates back to Unix timestamps. Unix time (also called epoch time or POSIX time) counts the number of seconds elapsed since January 1, 1970, 00:00:00 UTC. It is used throughout computer systems for logging, databases, APIs, file metadata, and event tracking because it is timezone-independent and trivial to sort and compare. This tool converts in both directions: enter a Unix timestamp (in seconds or milliseconds) to see the equivalent date in your local timezone and UTC, or enter a date and time to see the Unix timestamp. It also shows the current Unix timestamp updated in real time. Useful for developers debugging API responses with timestamp fields, database administrators checking event logs, and anyone who encounters a number like 1712160000 and needs to know what date it represents. To extend the output further, Age Calculator can calculate exact age from a birth date, Date Difference can handle related tasks, and JSON Formatter can format and validate JSON data.
Unix timestamps are deceptively simple but have several nuances worth knowing. Timestamps in seconds are the POSIX standard (used in Unix, Linux, and most C/C++ APIs). Timestamps in milliseconds are common in JavaScript (Date.now() returns milliseconds) and many modern web APIs and databases. If a timestamp like 1712160000000 seems too large for seconds, it is probably in milliseconds: divide by 1000 to get the second-precision value. The year 2038 problem (Y2K38) affects 32-bit signed integer timestamps: the maximum 32-bit signed value (2147483647) corresponds to January 19, 2038, 03:14:07 UTC. Systems that store timestamps as 32-bit signed integers will overflow on that date. Modern systems use 64-bit integers, which can represent dates billions of years in the past and future. Negative timestamps represent dates before January 1, 1970: -86400 is December 31, 1969. For JavaScript development, new Date(timestamp * 1000).toISOString() converts a second-precision timestamp to an ISO 8601 string. When working with APIs, timestamps are often in ISO 8601 format (2024-04-03T10:00:00Z) rather than Unix time, but the tool handles conversion between these formats as well.