RFC 3339 Date Converter

Free RFC 3339 date converter. Convert dates to internet standard timestamp format. Perfect for API development and data exchange.

Convert dates to and from RFC 3339 format, the internet standard for timestamps. Used extensively in APIs, JSON, and web services for consistent, parseable date representation.

Common use cases

  • API developers ensuring timestamp compliance
  • JSON data structure designers
  • Web service integrators handling dates
  • IoT developers standardizing sensor timestamps
  • Cloud developers working with serverless functions

How to use

  1. Enter a date in any format or an RFC 3339 string
  2. View the conversion in both directions
  3. Choose between full precision or simplified output
  4. Select timezone representation (Z or offset)
  5. Copy the formatted result

FAQ

How is RFC 3339 different from ISO 8601?

RFC 3339 is a profile of ISO 8601, restricting options for internet use. It always requires the T separator and timezone.

Should I use Z or a numeric offset?

Z indicates UTC. Use numeric offsets when the local timezone context is important.

Is millisecond precision required?

No, but it's allowed. Most APIs accept seconds precision (no decimal places).