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javajava.util.calendar

Determine how many days in a given month

I am doing some calculations based on no of days in a given month,

Determine current Year Month

Date date = new Date();
Year = YearFormat.format(date);
Month = MonthFormat.format(date);

Determine how many days in the current month

int year = Integer.valueOf(Year);
int month = Integer.valueOf(Month);
Calendar calendarD = new GregorianCalendar(year, month, 1);
int noOfDaysOfMonth = calendarD.getActualMaximum(Calendar.DAY_OF_MONTH);

Problem

noOfDaysOfMonth seems not giving me the correct no of days.

For example year = 2018 , month = 8 gave me 30 which I expect 31

Solution

  • LengthOfMonth method is for that. Besides, I think Calendar API shouldn't be used anymore. It is already old.

    LocalDate date = LocalDate.of(2019, 6, 20);
int days = date.lengthOfMonth();

    5 Reasons Why Java's old Date and Calendar API was Bad