2026-06-10
ISO 8601 vs Unix timestamp
Compare ISO 8601 strings and Unix timestamps for APIs, databases, logs, and debugging.
ISO 8601 and Unix timestamps both represent time, but they optimize for different needs. ISO 8601 is readable and can include timezone offsets. Unix timestamps are compact and easy to sort numerically.
Use the ISO 8601 Converter when you want a human-readable string. Use the Unix Timestamp Converter when you need to inspect numeric epoch values.
API design
Public APIs often prefer ISO 8601 because humans can inspect the payload. Internal systems and databases may prefer numeric values for compact storage and comparisons.
Avoid ambiguity
Do not send plain local date strings without timezone context. Use Z for UTC or an explicit offset such as +08:00.