The Calendar does not function as you expect it to. From the JavaDoc: The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week. In Java 8, Period class is used to define an amount of elapsed time with date-based values (years, months, days). Given below is a Java 8 program to calculate the age of a person from the date of birth. The java.util.Date class is part of the old data-time classes that are poorly designed, confusing, and troublesome. Avoid them. Instead use the java.time classes. java.time. The java.time framework is built into Java 8 and later. These classes supplant the old troublesome date-time classes such as java.util.Date, .Calendar, & java.text Here is an example: const date = new Date(2021, 8, 18); const day = date.getDate(); const month = date.getMonth() + 1; // getMonth () returns month from 0 to 11 const year = date.getFullYear(); const str = `$ {day}/$ {month}/$ {year}`; console.log( str); // 18/9/2021. Note that the getDate (), getMonth (), and getFullYear () methods return the 1. Introduction. Joda-Time is the most widely used date and time processing library, before the release of Java 8. Its purpose was to offer an intuitive API for processing date and time and also address the design issues that existed in the Java Date/Time API. The central concepts implemented in this library were introduced in the JDK core with 7NsK3ir.

java day of year