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[英]Get difference between two dates in years - without months - without days
[英]How to get list of months & years between two dates
我需要你的帮助,在两个日期之间获取字符串中的月份和年份列表。 用户将以String格式输入两个日期:
String date1 ="JAN-2015";
String date2 ="APR-2015";
所以结果应该是:
我尝试使用以下代码,但它给了我错误的结果:
List<Date> dates = new ArrayList<Date>();
String str_date ="JAN-2015";
String end_date ="APR-2015";
DateFormat formatter ;
formatter = new SimpleDateFormat("MMM-yyyy");
Date startDate = formatter.parse(str_date);
Date endDate = formatter.parse(end_date);
long endTime =endDate.getTime() ;
long curTime = startDate.getTime();
while (curTime <= endTime) {
dates.add(new Date(curTime));
curTime ++;
}
for(int i=0;i<dates.size();i++){
Date lDate =(Date)dates.get(i);
String ds = formatter.format(lDate);
System.out.println(ds);
}
使用较少的代码和基本的Java库并获得您要求的结果。 所以你可以修改date1和date2变量。
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Main {
public static void main(String[] args) {
String date1 = "JAN-2015";
String date2 = "APR-2015";
DateFormat formater = new SimpleDateFormat("MMM-yyyy");
Calendar beginCalendar = Calendar.getInstance();
Calendar finishCalendar = Calendar.getInstance();
try {
beginCalendar.setTime(formater.parse(date1));
finishCalendar.setTime(formater.parse(date2));
} catch (ParseException e) {
e.printStackTrace();
}
while (beginCalendar.before(finishCalendar)) {
// add one month to date per loop
String date = formater.format(beginCalendar.getTime()).toUpperCase();
System.out.println(date);
beginCalendar.add(Calendar.MONTH, 1);
}
}
}
如果您的Java版本<8,您可以使用Calendar,如下所示:
private final static DateFormat formatter = new SimpleDateFormat("MMM-yyyy", Locale.ENGLISH);
public static void main(String[] args) throws ParseException {
Calendar startDate = stringToCalendar("Jan-2015");
Calendar endDate = stringToCalendar("Apr-2015");
while (startDate.before(endDate)) {
System.out.println(formatter.format(startDate.getTime()));
startDate.add(Calendar.MONTH, 1);
}
}
private static Calendar stringToCalendar(String string) throws ParseException {
Date date = formatter.parse(string);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar;
}
如果您拥有Java 8的奢侈品,那么代码就会变得更加简单:
public static void main(String[] args) {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM-yyyy", Locale.ENGLISH);
YearMonth startDate = YearMonth.parse("Jan-2015", formatter);
YearMonth endDate = YearMonth.parse("Apr-2015", formatter);
while(startDate.isBefore(endDate)) {
System.out.println(startDate.format(formatter));
startDate = startDate.plusMonths(1);
}
}
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