Formats a week number according to the specified scheme.
'iso'
'us'
'simple'
Math.ceil(dayOfYear / 7)
The date to compute the week number for.
The week numbering scheme: 'iso', 'us', or 'simple'.
The week number as a positive integer.
Formats a week number according to the specified scheme.
'iso': ISO 8601 (week 1 contains the first Thursday; Monday start).'us': Week 1 contains January 1; Sunday start.'simple':Math.ceil(dayOfYear / 7).