How to extract day, month and year from Date using Java? [duplicate]

问题

This question already has answers here:

How to get year, month, day, hours, minutes, seconds and milliseconds of the current moment in Java? (10 answers)

I want to get Year, Month, Day, etc from Java Date to compare with Gregorian Calendar date in Java. Is this possible? (8 answers)

Closed 7 months ago.

SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
Date date = formatter.parse("2020/05/06"); 

I need to extract day, month and year from it i.e.

int day = 06;
int  month = 05;
int year = 2020;

but when I use

int day = date.getDay();
int month = date.getMonth();
int day = date.getYear(); 

its not working.

回答1:

Don't use Date as it is deprecated. Use LocalDate and DateTimeFormatter as follows.

LocalDate ld  = LocalDate.parse("2020/05/06", 
              DateTimeFormatter.ofPattern("yyyy/MM/dd"));
int year = ld.getYear();
int month = ld.getMonthValue();
int day = ld.getDayOfMonth();
System.out.println(month + " " + day + " " + year);

Prints

5 6 2020

Check out the other date/time related classes in the java.time package.

回答2:

It's much better to use the new api as answered by WJS but if for some reason you want to use the old api you should use Calendar

SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
formatter.parse("2020/11/06");
Calendar calendar = formatter.getCalendar();

int day = calendar.get(Calendar.DAY_OF_MONTH);
int month = calendar.get(Calendar.MONTH) + 1; // add 1 because it returns 0-11
int year = calendar.get(Calendar.YEAR);

System.out.println(day);
System.out.println(month);
System.out.println(year);

来源：https://stackoverflow.com/questions/62643131/how-to-extract-day-month-and-year-from-date-using-java