java check if dates are the same day

To check if two dates in Java represent the same day, you can use the getDayOfYear and getYear methods of the Calendar class to get the day of the year and year for each date, and then compare the values.

Here's an example of how to check if two dates are the same day using the Calendar class:

import java.util.Calendar;
import java.util.Date;

public class Main {
  public static void main(String[] args) {
    Calendar cal1 = Calendar.getInstance();
    cal1.setTime(new Date(1));  // set to January 1, 1970
    int day1 = cal1.get(Calendar.DAY_OF_YEAR);
    int year1 = cal1.get(Calendar.YEAR);

    Calendar cal2 = Calendar.getInstance();
    cal2.setTime(new Date(86400000));  // set to January 2, 1970
    int day2 = cal2.get(Calendar.DAY_OF_YEAR);
    int year2 = cal2.get(Calendar.YEAR);

    if (day1 == day2 && year1 == year2) {
      // dates are the same day
    } else {
      // dates are not the same day
    }
  }
}

In this example, the Calendar objects cal1 and cal2 are used to represent two dates. The getDayOfYear and getYear methods are used to get the day of the year and year for each date.