Fast ISO8601 date time parser for Python written in C

Parse a RFC 3339 duration string into time.Duration

Parser and printer for date-times in ISO8601

Go package for encoding time in JSON in ISO 8601 format

RFC3339 (dates and times) implementation for Nim.

RFC 3339 compliant date/time data types.

RFC 3339 Date Parser

RFC3339 Date/Time String Formatters

This is an Ada 2012 library that implements the internet time protocol RFC-3339