The modern approach uses the java.time classes. For the month name, if in English, change to all uppercase and use to retrieve a Month enum object. Combine with your year and day-of-month to get a LocalDate object. int year = 2019 ; int dayOfMonth = 23 ; LocalDate ld = LocalDate.of ( year , month , dayOfMonth ) ; Years that are evenly divisible by 100 are not leap years, unless they are also evenly divisible by 400, in which case they are leap years. So if you want to reinvent the wheel: boolean isLeapYear = year%4 == 0 && (year%100 != 0 || year%400 == 0) But the most elegant solution (taken from here) is probably. public static boolean isLeapYear (int 5. You might try my lib Time4J which offers a Jewish/Hebrew calendar and use following code: HebrewCalendar hebcal = HebrewCalendar.nowInSystemTime (); int weekOfYear = hebcal.getInt (HebrewCalendar.WEEK_OF_YEAR); It uses the default week model/definition in Israel which starts the week on Sunday (after Sabbat). LocalDate date = LocalDate.ofEpochDay ( 18269 ); And finally, let’s create one with the year and day-of-year values: LocalDate date = LocalDate.ofYearDay ( 2020, 8 ); 3. Create a LocalDate by Parsing a String. The last option is to create a date by parsing a string. We can use the parse method with only a single argument to parse a date in .

java day of year