Warning: excessive nitpicking ahead.
Ashley Winters skribis 2004-12-08 10:51 (-0800):
> rule year { \d<4> }
\d**{4}
Or, well, \d**{2,4}
> rule month { \d<2> }
\d**{2}
> rule date { <year> -? <month> -? <day> }
rule week { \d**{2} }
rule yday { \d**{3} }
rule date {
<year>
[
-?
[
<yday>
|
[ [ W<week> | <month> ] [ -? <day> ]? ]
]
]?
} # :)
> rule time { <hour> \:? <minute> \:? <second> [\. <fraction>]? }
Likewise making parts optional, and "." can also be ",".
> rule datetime { <date> T <time> }
rule timezone { Z | <[+-]> <hour> [ \:? <minute> ]? }
rule datetime { <date> [ T <time> <timezone>? ]? }
And still this isn't a full ISO8601 grammar. But I it now covers every
notation that I have seen in the wild so far. A useful source of
information, apart from the ISO standard itself, is
DateTime-Format-ISO8601.
Juerd
