Konverter Timestamp

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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.