Epoch Converter

Midnight UTC on 1 January 1970. Every Unix timestamp is the number of seconds elapsed since that instant, ignoring leap seconds. Negative values represent times before it, which is how dates of birth before 1970 are stored in these systems.

ISO 8601 with an explicit offset, such as 2026-07-23T14:30:00Z, for anything human-facing or interchanged between systems. It sorts lexicographically, is unambiguous, and every language parses it. Store an integer epoch when you need compactness and arithmetic.