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bug 326270 fixes calWeekTitleService for leap years patch by mschroeder, r=mvl

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This commit is contained in:
mattwillis%gmail.com 2006-05-15 02:16:22 +00:00
parent 792a02421d
commit 6c8a5823b7
1 changed files with 25 additions and 19 deletions
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44
calendar/base/src/calWeekTitleService.js
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@ -68,26 +68,25 @@ function getWeekTitle(aDateTime) {
* as week 1.)
*/
// The week number is the number of days since the start of week
// one, divided by 7, plus 1 (so the first week is W1, not W0).
// Week one is the week containing the first Thursday.
// The week number is the number of days since the start of week 1,
// divided by 7 and rounded up. Week 1 is the week containing the first
// Thursday of the year.
// Thus, the week number of any day is the same as the number of days
// between the thursday of that week and the thursday of week one,
// divided by 7, plus 1. (This takes care of days at end/start of
// year which may be part of last/first week in other year.)
// between the Thursday of that week and the Thursday of week 1, divided
// by 7 and rounded up. (This takes care of days at end/start of a year
// which may be part of first/last week in the other year.)
// The Thursday of a week is the Thursday that follows the first day
// of the week.
//
// The week number of a day is the same as the week number of
// the first day of the week. (This takes care of days near the
// start of the year, which may be part of the week counted in
// the previous year.) So we need the start weekDay.
// The week number of a day is the same as the week number of the first
// day of the week. (This takes care of days near the start of the year,
// which may be part of the week counted in the previous year.) So we
// need the startWeekday.
const SUNDAY = 0;
var startWeekday = SUNDAY; // default to monday per ISO8601 standard.
try {
var prefBranch = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);
startWeekDay = prefBranch.getIntPref("calendar.week.start");
startWeekday = prefBranch.getIntPref("calendar.week.start");
} catch (e) {}
// The number of days since the start of the week.
@ -95,18 +94,25 @@ function getWeekTitle(aDateTime) {
// We correct for that by adding 7, and then using the remainder operator.
var sinceStartOfWeek = (aDateTime.weekday - startWeekday + 7) % 7;
// The number of days to thursday is the difference between Thursday
// and the start day of the week (again corrected for negative values)
// The number of days to Thursday is the difference between Thursday
// and the start-day of the week (again corrected for negative values).
const THURSDAY = 4;
var startToThursday = (THURSDAY - startWeekday + 7) % 7;
// The yearday number of the thursday this week
// The yearday number of the Thursday this week.
var thisWeeksThursday = aDateTime.yearday - sinceStartOfWeek + startToThursday;
// For the first few days of the year, we might still be in week 52.
if (thisWeeksThursday < 0)
thisWeeksThursday += 52*7;
// For the first few days of the year, we might still be in week 52 or 53.
if (thisWeeksThursday < 1) {
var lastYearDate = aDateTime.clone();
lastYearDate.year -= 1;
thisWeeksThursday += lastYearDate.endOfYear.yearday;
}
var weekNumber = Math.floor(thisWeeksThursday/7)+1;
// For the last few days of the year, we might already be in week 1.
if (thisWeeksThursday > aDateTime.endOfYear.yearday)
thisWeeksThursday -= aDateTime.endOfYear.yearday;
var weekNumber = Math.ceil(thisWeeksThursday/7);
return weekNumber;
};