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I’m using the library DateTime to store date values for birthdays.
DateTime dateTime01Abegin = new DateTime(2013, 5, 23, 00, 00);
DateTime dateTime01Bbegin = new DateTime(2012, 5, 22, 00, 00);
Running the method .getDayOfYear() on them, I am getting a value of 143 for both. But one is May 23rd and one is May 22nd – I can’t figure why they’re returning the same value!
2012 has 366 (february 29) days and 2013 has 365, that’s why both dates return 143.
The count of the days in a year has an offset of one day in leap years, since after february 28 leap years have an additional day compared to normal ones.