According to the start date and end date, the results returned by year, week, and day:
Member methods of the Calendar class
static Calendar getInstance() Get a calendar using the default timezone and locale. Calendar object is generated by this method. As follows: Calendar cr=Calendar.getInstance(); public void set(int year,int month,int date ,int hourofday,int minute,int second) Set the year, month, day, hour, minute, and second of the calendar. public int get(int field) Returns the value of the given calendar field. The so-called fields are year, month, day and so on. public void setTime(Date date) Sets the time for this calendar with the given Date. Date——Calendar public Date getTime() Back A Date representing the time for this calendar. Calendar—–Date abstract void add(int field,int amount) Adds or subtracts the amount of time to the specified field, according to the rules of the calendar. public long getTimeInMillies() Returns the time value of this calendar in milliseconds.
time unit field
YEAR year MINUTE minute DAY_OF_WEEK_IN_MONTH MONTH month SECOND/MILLISECOND seconds/milliseconds WEEK_OF_MONTH DATE day DAY_OF_MONTH Same as Date DAY_OF_YEAR HOUR_OF_DAY hour DAY_OF_WEEK Day of the week WEEK_OF_YEAR query
DAY_OF_WEEK, Monday is 2, Sunday is 1
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
public class DateRange {
// Format the year, month, day, hour, minute, and second
public static String DATE_YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";
public static String DATE_YYYY_MM = "yyyy-MM-dd";
public static List getNextWeekDateList(String startDate, String endDate) throws ParseException {
List<String> dateList = new ArrayList<>();
List<String> list = new ArrayList<>();
// format format
SimpleDateFormat sdf = new SimpleDateFormat(DATE_YYYY_MM_DD_HH_MM_SS);
SimpleDateFormat sdf1 = new SimpleDateFormat(DATE_YYYY_MM);
//Convert string type to Date type
Calendar start = Calendar. getInstance();
Date startDate1 = sdf. parse(startDate);
start.setTime(startDate1);
Calendar end = Calendar. getInstance();
Date endDate1 = sdf. parse(endDate);
end.setTime(endDate1);
//Calculate the difference in days between two days
long time = (endDate1.getTime() - startDate1.getTime()) / 1000 / 3600 / 24;
for (int i = 0; i <= time; i ++ ) {
//Create a calendar instance
Calendar start1 = Calendar. getInstance();
start1.setTime(startDate1);
start1.add(Calendar.DAY_OF_MONTH, i);
//Clear the hours, minutes and seconds
start1.set(Calendar.HOUR_OF_DAY, 00);
start1.set(Calendar. MINUTE, 00);
start1.set(Calendar.SECOND, 00);
//store start time
if (i == 0){
start1.setTimeInMillis(start.getTimeInMillis());
}
dateList.add(sdf.format(start1.getTime()));
//Create end time
Calendar end1 = Calendar. getInstance();
end1.setTime(start1.getTime());
//Clear the minutes and seconds to zero when the end time
end1.set(Calendar.HOUR_OF_DAY, 23);
end1.set(Calendar. MINUTE, 59);
end1.set(Calendar.SECOND, 59);
//deposit end time
if (i == time){
end1.setTimeInMillis(end.getTimeInMillis());
}
dateList.add(sdf.format(end1.getTime()));
}
for (int i = 0; i<dateList. size(); i ++ ){
Calendar calendar = Calendar. getInstance();
calendar.setTime(sdf.parse(dateList.get(i)));
Calendar calendar2 = Calendar. getInstance();
//Judge whether the current time year is inconsistent with the next year
if (i + 1 != dateList. size()){
calendar2.setTime(sdf.parse(dateList.get(i + 1)));
if (calendar.get(Calendar.YEAR) != calendar2.get(Calendar.YEAR)){
list.add(dateList.get(i));
list.add(dateList.get(i + 1));
}
}
// save start time
list.add(dateList.get(0));
//Judge whether it is Monday of this week, judge whether the start time and deadline are on the same day, judge whether the previous number is equal to the second number, if they are equal, stay
//Monday is 2
if (i > dateList.size() -14 & amp; & amp; calendar.get(Calendar.DAY_OF_WEEK) == 2 & amp; & amp; i + 1!=dateList.size() & amp; & amp; sdf1.parse(dateList.get(i)).equals(sdf1.parse(dateList.get(i+1)))){
//Judge whether Monday is the starting time, if not, save it to the day before Monday
if (i-1>=0){
list.add(dateList.get(i-1));
}
list.add(dateList.get(i));
}
//Today's date + previous day's date
if (i == dateList.size() -2 || i == dateList.size() -1 || i == dateList.size() -3){
list.add(dateList.get(i));
}
}
List<String> myList = list. stream(). distinct(). collect(Collectors. toList());
List<DateInfo> list1 = new ArrayList<>();
System.out.println(myList.size());
for (int i = 0; i < myList. size() - 1; i ++ ) {
list1. add(new DateInfo(myList. get(i), myList. get(i + 1)));
i + + ;
}
return list1;
}
public static void main(String[] args) throws ParseException {
List<DateInfo> list = DateRange.getNextWeekDateList("2022-12-09 12:12:12","2023-01-12 21:12:12");
for (DateInfo l : list){
System.out.println(l);
}
}
//result set DateInfo(startDate=2022-12-09 12:12:12, endDate=2022-12-31 23:59:59) DateInfo(startDate=2023-01-01 00:00:00, endDate=2023-01-08 23:59:59) DateInfo(startDate=2023-01-09 00:00:00, endDate=2023-01-11 23:59:59) DateInfo(startDate=2023-01-12 00:00:00, endDate=2023-01-12 21:12:12)
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