Epoch Converter

Unix epoch time (also called POSIX time or Unix timestamp) counts the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — the Unix epoch. This single number representation of time is used extensively in programming because it is timezone-independent, easily comparable (simple integer comparison determines chronological order), compact (a single number vs a formatted date string), and mathematically operable (adding 86400 to a timestamp advances it by exactly one day). Most programming languages and databases use epoch timestamps internally. JavaScript's Date.now() returns milliseconds since epoch (13 digits), while Unix systems and most APIs use seconds since epoch (10 digits). The AllTools Epoch Converter converts between epoch timestamps and human-readable dates in both directions. Enter a timestamp to see the corresponding date, or enter a date to get the timestamp. The tool handles both seconds (10-digit) and milliseconds (13-digit) formats automatically. It displays results in UTC and your local timezone, showing the timezone offset. All conversion uses JavaScript's Date object in the browser — your timestamp data stays on your device.

Epoch timestamp conversion is a daily debugging task for developers working with APIs, databases, and log files. API responses frequently include timestamps as integers — created_at: 1711123200 — that need conversion to verify the correct date. Database records use epoch timestamps for created, updated, and deleted fields. Log files timestamp entries in epoch format for machine-parseable chronological ordering. JWT tokens store expiration (exp) and issued-at (iat) claims as epoch timestamps that need conversion during debugging. Caching systems use epoch timestamps for TTL (time-to-live) calculations. Common debugging scenarios include: verifying that an API response timestamp matches the expected event time, checking whether a JWT token has expired by comparing the exp claim to the current epoch time, confirming that database records were created in the expected order, and diagnosing timezone-related bugs where a timestamp is interpreted in the wrong timezone. The year 2038 problem (Y2K38) occurs when 32-bit signed integer timestamps overflow on January 19, 2038 — the AllTools converter helps identify whether timestamps are stored in 32-bit or 64-bit format by their magnitude and range.