1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/*
Dates.cpp
This file is part of Charm, a task-based time tracking application.
Copyright (C) 2010-2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Author: Frank Osterfeld <frank.osterfeld@kdab.com>
Author: Olivier JG <olivier.de.gaalon@kdab.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Dates.h"
#include <QDate>
//find date for a certain weekday in week no/year
QDate Charm::dateByWeekNumberAndWeekDay(int year, int week, int day)
{
QDate start(year, 1, 1);
if (start.weekNumber() != 1) // if Jan 1st is not in the week 1 (but week 53 of the previous year), add a week
start = start.addDays(7);
int wdyear = 0;
const int wdweek = start.weekNumber(&wdyear);
// now we really should be in week 1 of year
Q_ASSERT(wdweek == 1);
Q_UNUSED(wdweek);
Q_ASSERT(wdyear == year);
//now go to the requested weekday, in week 1:
start = start.addDays(day - start.dayOfWeek());
//now go forward to the requested week no.
const QDate date = start.addDays(7 * (week - 1));
return date;
}
QDate Charm::weekDayInWeekOf(Qt::DayOfWeek dayOfWeek, const QDate &date)
{
return date.addDays(dayOfWeek - date.dayOfWeek());
}
int Charm::numberOfWeeksInYear(int year)
{
QDate d(year, 1, 1);
d = d.addDays(d.daysInYear() - 1);
int weeksInYear = d.weekNumber() == 1 ? 52 : d.weekNumber();
Q_ASSERT(weeksInYear == 52 || weeksInYear == 53);
return weeksInYear;
}
int Charm::weekDifference(const QDate &from, const QDate &to)
{
int fromWeekYear, toWeekYear;
const int fromWeekNumber = from.weekNumber(&fromWeekYear);
const int toWeekNumber = to.weekNumber(&toWeekYear);
int weeksForInterveningYears = 0;
for (int year = fromWeekYear; year < toWeekYear; ++year)
weeksForInterveningYears += numberOfWeeksInYear(year);
return toWeekNumber + weeksForInterveningYears - fromWeekNumber;
}
|
