If you need the ISO week this is what I'm using in GWT:
private static final int ISO_THURSDAY = 4;
private static final int MAX_DAY_OF_WEEK = 6;
private static final int DAYS_IN_WEEK = 7;
private static final long MILLIS_DAY = 86400000;
@SuppressWarnings("deprecation")
public int getWeek() {
// http://en.wikipedia.org/wiki/Talk:ISO_week_date#Algorithms
final Date date = toDate();
// ISO week day (Mon=1 to Sun=7)
final int dayOfWeek = 1 + (date.getDay() + MAX_DAY_OF_WEEK) %
DAYS_IN_WEEK;
final Date nearestThu = addDays(date, ISO_THURSDAY - dayOfWeek);
final int year = nearestThu.getYear();
final Date jan1 = new Date(year, 0, 1);
return 1 + dayDiff(nearestThu, jan1) / DAYS_IN_WEEK;
}
public static Date addDays(final Date sourceDate, final long days) {
return new Date(sourceDate.getTime() + (days * MILLIS_DAY));
}
public static int dayDiff(final Date firstDate, final Date secondDate) {
return (int) ((firstDate.getTime() - secondDate.getTime()) /
MILLIS_DAY);
}
On Thu, Aug 5, 2010 at 17:15, Glimpse <frederic.bonj...@gmail.com> wrote:
> Hello all,
>
> I'd like to know if there is an easy way to get the week number from a
> Date object. In pure Java, the Calendar class does the trick via a
> call to get(Calendar.WEEK_OF_YEAR); but the Calendar class is not
> available in GWT.
>
> Any idea?
>
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