- (
NSInteger)
weekOfYear;
Availability: Not in OpenStep/MacOS-X
The ISO standard week of the year is based on the first
week of the year being that week (starting on monday)
for which the thursday is on or after the first of
january.
This has the effect that, if
january first is a friday, saturday or sunday, the
days of that week (up to and including the sunday) are
considered to be in week 53 of the preceding
year. Similarly if the last day of the year is a
monday tuesday or wednesday, these days are part of
week 1 of the next year.