How to determine whether two dates are the same day in java

Java method to determine whether two dates are the same day:

1. Use Calendar to implement

Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal1.setTime(date1);
cal2.setTime(date2);
boolean sameDay = cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
    cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR);

Calendar.YEAR can get which date it is Year, use cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) to determine whether two dates are in the same year.

The main function of Calendar.DAY_OF_YEAR is cal.get(DAY_OF_YEAR), which is used to get the day of the year that this day is.

Use cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR) to determine whether two dates are on the same day of the year.

2. Use SimpleDateFormat to determine

SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMdd");
return fmt.format(date1).equals(fmt.format(date2));

For more java knowledge, please pay attention to the java Basic Tutorial column.

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