In an ISO 8601 date, is the T character mandatory?

Question

I\'m wondering if the following date is ISO8601 compliant :

2012-03-02 14:57:05.456+0500

(for sure, 2012-03-02T14:57:05.456+0500 is complia

Answer 1

That date is not ISO-8601 compliant as Keith Thompson indicated, but it is compliant with RFC 3339, a profile of ISO 8601. Sort of. See NOTE at the bottom of the following text from RFC 3339:

date-time       = full-date "T" full-time

  NOTE: Per [ABNF] and ISO8601, the "T" and "Z" characters in this
  syntax may alternatively be lower case "t" or "z" respectively.

  This date/time format may be used in some environments or contexts
  that distinguish between the upper- and lower-case letters 'A'-'Z'
  and 'a'-'z' (e.g. XML).  Specifications that use this format in
  such environments MAY further limit the date/time syntax so that
  the letters 'T' and 'Z' used in the date/time syntax must always
  be upper case.  Applications that generate this format SHOULD use
  upper case letters.

  NOTE: ISO 8601 defines date and time separated by "T".
  Applications using this syntax may choose, for the sake of
  readability, to specify a full-date and full-time separated by
  (say) a space character.