<dependency> <groupId>joda-time</groupId> <artifactId>joda-time</artifactId> <version>2.10.11</version> </dependency> import org.joda.time.DateTime; import org.joda.time.Days; import org.joda.time.Duration; import org.joda.time.format.DateTimeFormat; import org.joda.time.format.DateTimeFormatter; DateTime start = new DateTime(2021, 1, 1, 0, 0); DateTime end = new DateTime(2021, 12, 31, 23, 59); int days = Days.daysBetween(start, end).getDays(); System.out.println("Days between start and end: " + days); DateTime date = new DateTime(2021, 1, 1, 0, 0); DateTime newDate = date.plusDays(10); System.out.println("New date: " + newDate); DateTime date = new DateTime(); DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss"); String formattedDate = date.toString(formatter); System.out.println("Formatted date: " + formattedDate);