Hvad handler ISO8601 om - se nedenfor
Er år 1900 skudår - iso8601 siger nej - se nedenfor:A summary of the international standard date and time notation
Resume af citatet ovenfor på dansk:Leap years are years with an additional day YYYY-02-29,
where the year number is a multiple of four
with the following exception: If a year is a multiple of 100,
then it is only a leap year if it is also a multiple of 400.
For example, 1900 was not a leap year, but 2000 is one.
År 1900 var ikke skudår
År 2000 var skudår
Mvh. Jørgen