محول Timestamp Unix

The Unix timestamp — also called epoch time or POSIX time — is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, a moment known as the Unix epoch. This deceptively simple number underpins virtually every date and time operation in computing: database records, server logs, API responses, filesystem metadata, authentication tokens, cache expiry headers and cryptographic certificates all use Unix timestamps internally. The format is universal, timezone-independent, and immune to daylight saving time confusion — making it the preferred timestamp format for any system that needs to store, compare or transmit time with absolute precision. Our converter handles both standard second-precision timestamps and millisecond-precision timestamps (13 digits, as used by JavaScript's Date.now()), and displays the live current timestamp updating every second.

Unix timestamps appear constantly in JSON API responses — often as fields named created_at, updated_at, expires_in or iat. When you are inspecting an API response or debugging a JWT token, our JSON Formatter & Validator lets you beautify and read the full response structure — and once you identify the timestamp fields, paste them here for instant human-readable conversion. The two tools together make API debugging significantly faster and less error-prone.

For calculating the exact number of calendar days between two timestamps — for example, to determine how many days an authentication token has been active, or how long a database record has existed — our Date Calculator accepts specific dates and computes the interval in days, weeks and months with the same precision. It is an essential companion for any backend developer who works with time-sensitive data.

What is the Unix epoch and why was January 1, 1970 chosen?

The Unix epoch — 00:00:00 UTC on 1 January 1970 — was chosen by the designers of the Unix operating system at Bell Labs in the early 1970s as a convenient recent date that was neither too far in the past (creating very large numbers) nor in the future. It was a practical engineering choice, not a mathematically significant one. The Unix timestamp counts every second elapsed since that moment and is stored as a 32-bit signed integer in many legacy systems — which creates the Year 2038 Problem (Y2K38): on 19 January 2038 at 03:14:07 UTC, 32-bit signed integers will overflow and roll back to 1901. Most modern systems now use 64-bit integers, which will not overflow for approximately 292 billion years.

Milliseconds vs seconds: which format does your data use?

A key practical issue when working with timestamps is distinguishing second-precision (10 digits, e.g. 1700000000) from millisecond-precision (13 digits, e.g. 1700000000000). JavaScript's Date.now() returns milliseconds; Unix command-line tools return seconds; most databases store seconds. Our converter automatically detects which format you are using based on the number of digits. Pair with our JSON Formatter to inspect API responses containing timestamps.