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comment(CalendarDate.js): adds comments to the functions: firstDayOfCalendarMonth, lastDayOfCalendarMonth, firstDayOfWeek, lastDayOfWeek

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SimonGschnell
2025-01-09 15:04:30 +01:00
parent 848d50ec93
commit d9375e2c8b
1 changed files with 9 additions and 2 deletions
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public/js/composables/CalendarDate.js
+9 -2
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@@ -63,6 +63,8 @@ class CalendarDate {
}
get firstDayOfWeek() {
let firstDayOfWeek = new Date(this.y, this.m, this.d);
// the following calculation can be seen as = this.d - (firstDayOfWeek.getDay()-this.weekStart)
// to ensure that firstDayOfWeek.getDay() is always greater than this.weekStart we add 7 and wrap the result around with %7
firstDayOfWeek.setDate(this.d -(firstDayOfWeek.getDay()+7-this.weekStart)%7);
return firstDayOfWeek;
}
@@ -71,6 +73,7 @@ class CalendarDate {
}
get lastDayOfWeek() {
let lastDayOfWeek = new Date(this.y, this.m, this.d);
// uses the calculation from firstDayOfWeek and adds 6 days to the result to get the last day of the week
lastDayOfWeek.setDate(this.d -(lastDayOfWeek.getDay()+7-this.weekStart)%7 +6);
return lastDayOfWeek;
}
@@ -88,15 +91,19 @@ class CalendarDate {
}
get firstDayOfCalendarMonth() {
let firstDayOfMonth = new Date(this.y, this.m, 1);
return new Date(this.y, this.m, 1-(firstDayOfMonth.getDay() + 7 - this.weekStart)%7);
let offset = (firstDayOfMonth.getDay() + 7 - this.weekStart) % 7;
// offset will be greater than 1 most of the time, using a negative number for a date returns a date in the past
return new Date(this.y, this.m, 1-offset);
}
get cdFirstDayOfCalendarMonth() {
let firstDayOfMonth = new Date(this.y, this.m, 1);
return new CalendarDate(this.y, this.m, 1-(firstDayOfMonth.getDay() + 7 - this.weekStart)%7);
}
get lastDayOfCalendarMonth() {
// In JavaScript, the Date constructor interprets: A day of 0 as the last day of the previous month
let lastDayOfMonth = new Date(this.y, this.m+1, 0);
return new Date(lastDayOfMonth.getFullYear(), lastDayOfMonth.getMonth(), lastDayOfMonth.getDate()+6-(lastDayOfMonth.getDay() + 7 - this.weekStart)%7);
let offset = (lastDayOfMonth.getDay() + 7 - this.weekStart) % 7;
return new Date(lastDayOfMonth.getFullYear(), lastDayOfMonth.getMonth(), lastDayOfMonth.getDate()+6-offset);
}
get cdLastDayOfCalendarMonth() {
let lastDayOfMonth = new Date(this.y, this.m+1, 0);