#Date durations iso#

вЂњBasic format' as defined in ISO 8601, which omits separators (e.g. Extended formatД®DTF requires вЂњextended formatвЂќ as defined in 8601: hyphen between calendar components and colon between clock components (e.g. Two communication parties that agree to operate according to this specification must suppress, during their communication, any features of ISO 8601-1 that are not included in level 0.

Level 1 is supported, and in addition the following features of level 2 are supported (list features).

Level 0 is supported, and in addition the following features of levels 1 and 2 are supported (list features).

The vendor must state one of the following levels of support: Level 0 specifies features of ISO 8601-1 Levels 1 and 2 specify features described ISO 8601-2.ДЄn implementation must support all of the features listed for Level 0. Three conformance levels are defined: level 0, level 1, and level 2.

the significant digit indicator 'p' is now 'S' (uppercase).

the year prefix 'y' and the exponential indicator 'e', both previously lowercase, are now 'Y' and 'E' (uppercase) and.

the extended interval syntax keywords 'unknown' and 'open' have been replaced with null and the double-dot notation respectively.вЂњqualification from the leftвЂќ is introduced and replaces the grouping mechanism using parentheses.the uncertain and approximate qualifiers, '?' and '~', when applied together, are combined into a single qualifier character '%'.the unspecified date character (formerly lower case вЂuвЂ™) is superseded by the character (upper case) 'X'.This specification differs from the earlier draft

#Date durations full#

The full functionality of the draft specification is retained in this specification, however several syntactic changes were necessary, to satisfy international requirements. Note, in particular, a draft specification was issued in 2012. It defines features to be supported in a date/time string, features considered useful for a wide variety of applications. The Extended Date/Time Format (EDTF) was created by the Library of Congress with the participation and support of the bibliographic community as well as communities with related interests. Official Web Site Extended Date/Time Format (EDTF) Specification