Unix Tidsstämpel

Unix Timestamp kalkylatorn ger omedelbara, exakta beräkningar inom detta område. Ange dina värden och få omedelbart resultat med tydlig förklaring. Detta gratis verktyg fungerar helt i din webbläsare utan att data skickas eller lagras.

Exakta beräkningar inom detta område kräver förståelse av de underliggande formlerna och standarderna. Vår kalkylator tillämpar de mest accepterade metoderna rekommenderade av internationella institutioner och vetenskaplig konsensus. Oavsett om du arbetar med privatekonomi, hälsoövervakning, tekniska projekt eller utbildningsändamål — detta verktyg ger tillförlitliga resultat. Gratis, utan registrering, direkt användbart.

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.