Mega Code Archive
Get Next Monday
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/*
Copyright (C) 2008-2009 Dmitry Gusev <dmitry.gusev@gmail.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 3 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/>.
*/
import java.util.Calendar;
import java.util.Date;
public class Util {
public static Date getMonday(Date today) {
Calendar cal = Calendar.getInstance();
cal.setTime(today);
int dow = cal.get(Calendar.DAY_OF_WEEK);
while (dow != Calendar.MONDAY) {
int date = cal.get(Calendar.DATE);
if (date == 1) {
int month = cal.get(Calendar.MONTH);
if (month == Calendar.JANUARY) {
month = Calendar.DECEMBER;
cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) - 1);
} else {
month--;
}
cal.set(Calendar.MONTH, month);
date = getMonthLastDate(month, cal.get(Calendar.YEAR));
} else {
date--;
}
cal.set(Calendar.DATE, date);
dow = cal.get(Calendar.DAY_OF_WEEK);
}
return cal.getTime();
}
private static int getMonthLastDate(int month, int year) {
switch (month) {
case Calendar.JANUARY:
case Calendar.MARCH:
case Calendar.MAY:
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.OCTOBER:
case Calendar.DECEMBER:
return 31;
case Calendar.APRIL:
case Calendar.JUNE:
case Calendar.SEPTEMBER:
case Calendar.NOVEMBER:
return 30;
default: // Calendar.FEBRUARY
return year % 4 == 0 ? 29 : 28;
}
}
}
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