Added conversion methods
Added more HTML date/time formats
Added basic duration support
Added XML Schema duration format supports
Implemented periods
Added XML Schema date/time datatype parsers
For consistency: period->interval for consistency with ISO 8601; datetime->date_time
reordered
clarification
Added support for most Microdata and OGP date/time formats
fixed timezone handling
Implemented weekly time ranges
Implmented RFC 3339 based formats
Added HTTP realted parsers and serializers
Implemented date parser for RSS 2.0
Added JS date parse method
Added leap second data
Added parser for <time> values
leap second support
Support for years 0001-0999