update

src/main/java/com/qmth/exam/reserve/util/DateUtil.java

@@ -192,7 +192,7 @@ public class DateUtil {
     public static Date changeDateAndTimeBegin(Date date, int changeDays) {
         Calendar calendar = Calendar.getInstance();
         calendar.setTime(date);
-        calendar.add(Calendar.DATE, -changeDays);
+        calendar.add(Calendar.DATE, changeDays);
 
         calendar.set(Calendar.HOUR_OF_DAY, 0);
         calendar.set(Calendar.MINUTE, 0);
@@ -213,7 +213,7 @@ public class DateUtil {
     public static Date changeDateAndTimeEnd(Date date, int changeDays) {
         Calendar calendar = Calendar.getInstance();
         calendar.setTime(date);
-        calendar.add(Calendar.DATE, -changeDays);
+        calendar.add(Calendar.DATE, changeDays);
 
         calendar.set(Calendar.HOUR_OF_DAY, 23);
         calendar.set(Calendar.MINUTE, 59);