Unix Timestamp Conversion Guide
Unix timestamps represent the number of seconds (or milliseconds) elapsed since January 1, 1970 UTC. They provide a compact, language-agnostic way to store and compare times. Most integration bugs happen when systems mix seconds and milliseconds or forget timezone context.
When converting timestamps, first identify precision. A 10-digit value is usually seconds, while 13 digits usually indicates milliseconds. Interpreting one as the other leads to dates that are decades off. This error can silently break retention logic, scheduling, and analytics windows.
Always convert and display in UTC first, then apply user-local timezone formatting only for presentation. This separates storage truth from UI convenience. For auditing and incident response, UTC logs are easier to correlate across services.
In production, validate timestamp ranges, enforce a single precision per API contract, and document timezone expectations in endpoint docs. These controls prevent subtle time drift issues that are hard to debug after deployment.
Open related tool: Unix/Epoch Timestamp Converter
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