Here you can find the source of getStartDate(Date date, int weeks, Locale locale)
| Parameter | Description |
|---|---|
| date | a parameter |
| weeks | a parameter |
| locale | a parameter |
public static String getStartDate(Date date, int weeks, Locale locale)
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THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */ import java.text.DateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.Locale; public class Main { /** * This method receives the @params Date date,int weeks,Locale locale * It sets a Gregorian Calendar with the given Date, with the given locale * a format style is determined. By using the @param weeks that specifies the amount * of weeks that past, the corresponding week of year is calculated. Based on this value * the method getStartDateOfWeek is invoked. * getStartDateOfWeek is responsible for calculating the date of the first day of a * week of year. * * @param date * @param weeks * @param locale */ public static String getStartDate(Date date, int weeks, Locale locale) { Calendar cal_date = new GregorianCalendar(); cal_date.setTime(date); //format style DateFormat df = DateFormat.getDateInstance(DateFormat.FULL, locale); //get current week int startWeek = getWeek(weeks); cal_date.set(Calendar.WEEK_OF_YEAR, startWeek); String strstart = df.format(cal_date.getTime()); strstart = getStartDateOfWeek(cal_date.getTime(), locale); return strstart; } /** * This method subtracts the @param int duration that represents the weeks that past * from the current week, and obtains the corresponding week of year. * * @param duration */ public static int getWeek(int duration) { Calendar cal_date = new GregorianCalendar(); DateFormat df = DateFormat.getInstance(); int kalwoch = 0; cal_date.add(Calendar.WEEK_OF_YEAR, -duration); kalwoch = cal_date.get(Calendar.WEEK_OF_YEAR); return kalwoch; } /** * This method formats a Date to a String * * @param d * @param locale */ public static String format(Date d, Locale locale) { return format(d, locale, DateFormat.FULL); } /** * __UNDOCUMENTED__ * * @param d __UNDOCUMENTED__ * @param locale __UNDOCUMENTED__ * @param style __UNDOCUMENTED__ * @return __UNDOCUMENTED__ */ public static String format(Date d, Locale locale, int style) { //macht ein Datumsformat DateFormat df = DateFormat.getDateInstance(style, locale); //formats a Date to a string Corresponding to the given Locale String myDate = df.format(d); return myDate; } /** * this method parses the @params String day,month,year to ints, builds a Gregorian * Calendar with these values to get the corresponding Date that is returned as * String by invoking the method format(Date d,Locale locale), that used to parse a * Date to a String. * * @param day * @param month * @param year * @param locale */ public static String format(String day, String month, String year, Locale locale) { //parseInt(day,month,year) int tag = Integer.parseInt(day); int monat = Integer.parseInt(month); int jahr = Integer.parseInt(year); //buildGregorianCalendar for representation of a Date with jahr,tag,monat-1 Calendar cal = new GregorianCalendar(jahr, monat - 1, tag); Date d = cal.getTime(); return format(d, locale); } /** * __UNDOCUMENTED__ * * @return __UNDOCUMENTED__ */ public static int getTime() { Calendar cal = new GregorianCalendar(); Date d = cal.getTime(); int hour = cal.get(Calendar.HOUR_OF_DAY); return hour; } /** * This method sets a Gregorian Calendar according to the given Date * * @param selectedDate - it get the day of week, based on this the first * day of the corresponding week is calculated. * By using the method format(Date d,Locale locale) a String with the default format * style is returned. * @param locale */ private static String getStartDateOfWeek(Date selectedDate, Locale locale) { DateFormat df = DateFormat.getDateInstance(DateFormat.FULL, locale); Calendar cal_date = new GregorianCalendar(); cal_date.setTime(selectedDate); int strDay = cal_date.get(Calendar.DAY_OF_WEEK); cal_date.add(Calendar.DATE, -strDay + 1); return format(cal_date.getTime(), Locale.getDefault()); } }