Any hint?

Unfortunately, we can't know whether or not you have already solved the problem. You can get a Date object back from a String if you use this code: DateFormat dF = new SimpleDateFormat(" . . . ", Locale.ENGLISH); // Use "Time Patterns" Date date1 = dF.parse(stringDate); But you can also do the opposite. From the Date object you can get back any part of the date you want. You get them back as String. You can also get the following data from a Date object, e.g: - Number of Week in year - Number of Week in month - Number of Day in year - Number of Day in month - Number of Day of week etc. On this page are the details, "Time Patterns" : https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html Look for the key-letter for "Day in year" in the table and apply it. If you use this letter in the new SimpleDateFormat(" . . . "), you will be able to get as String what day of the year you are on. This is the data we were looking for! You just need to convert this string to an Integer, and you can easily tell if this number is odd or even. So: Create: DateFormat dF2 = new SimpleDateFormat(" . . . "), // Use "Time Patterns" String daysInThisYear = dF2.format(date1); SUMMARY: Write down in a notebook or print the following, it is important. You will often need the following concise summary for CG tasks: 1) You can get a Date object from a String, using the parse(String) method of the DateFormat object. The String must be in the correct format. The DateFormat must be created according to the corresponding date pattern, by combining the alphabetic characters in the link above. 2) You can get a String back from a Date object using the DateFormat object's format(dateObject) method. P.S: And at https://docs.oracle.com/javase/8/docs/api/java/util/Date.html you can find a bunch of useful methods you can use on Date objects.

Your approach is good. It just has a few teething problems. First I'd fix newDate. It needs to have the same year as date (the methods argument). Even CG told you it also could be 2020. And with that they mean any year. You could clone date and set month, year, sec, min and hour (or get the year and create that new date, as you like). Hihi, you'll have this finished in no time. Oh, and if you need to return a boolean, day % 2 == 0 already is one. No need for if-else.