2.1.7 [W3C-XSD] Section 3.2.7.1, Lexical representation

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V0007:

The specification states:

 The lexical space· of dateTime consists of finite-length sequences of characters of the form: '-'? yyyy '-' mm '-' dd 'T' hh ':' mm ':' ss ('.' s+)? (zzzzzz)?, where 
  
 - '-'? yyyy is a four-or-more digit optionally negative-signed numeral that represents the year; if more than four digits, leading zeros are prohibited, and '0000' is prohibited (see the Note above (§3.2.7); also note that a plus sign is not permitted);
 - the remaining '-'s are separators between parts of the date portion;
 the first mm is a two-digit numeral that represents the month;
 - dd is a two-digit numeral that represents the day;
 - 'T' is a separator indicating that time-of-day follows;
 = hh is a two-digit numeral that represents the hour; '24' is permitted if the minutes and seconds represented are zero, and the dateTime value so represented is the first instant of the following day (the hour property of a dateTime object in the ·value space· cannot have a value greater than 23);
 - ':' is a separator between parts of the time-of-day portion;
 - the second mm is a two-digit numeral that represents the minute;
 - ss is a two-integer-digit numeral that represents the whole seconds;
 = '.' s+ (if present) represents the fractional seconds;
 - zzzzzz (if present) represents the timezone (as described below).

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Leading zeros are accepted if yyyy is more than four digits, such as 01987-10-12T00:00:00.