Creating java date object from year,month,day

Question

int day = Integer.parseInt(request.getParameter(\"day\"));  // 25
int month = Integer.parseInt(request.getParameter(\"month\")); // 12
int year = Integer.parseInt(re         


        

Answer 1

Java's Calendar representation is not the best, they are working on it for Java 8. I would advise you to use Joda Time or another similar library.

Here is a quick example using LocalDate from the Joda Time library:

LocalDate localDate = new LocalDate(year, month, day);
Date date = localDate.toDate();

Here you can follow a quick start tutorial.

Answer 2

See JavaDoc:

month - the value used to set the MONTH calendar field. Month value is 0-based. e.g., 0 for January.

So, the month you set is the first month of next year.

Answer 3

Make your life easy when working with dates, timestamps and durations. Use HalDateTime from

http://sourceforge.net/projects/haldatetime/?source=directory

For example you can just use it to parse your input like this:

HalDateTime mydate = HalDateTime.valueOf( "25.12.1988" );
System.out.println( mydate );   // will print in ISO format: 1988-12-25

You can also specify patterns for parsing and printing.

Answer 4

That's my favorite way prior to Java 8:

Date date = new GregorianCalendar(year, month - 1, day).getTime();

I'd say this is a cleaner approach than:

calendar.set(year, month - 1, day, 0, 0);

Answer 5

java.time

Using java.time framework built into Java 8

int year = 2015;
int month = 12;
int day = 22;
LocalDate.of(year, month, day); //2015-12-22
LocalDate.parse("2015-12-22"); //2015-12-22
//with custom formatter 
DateTimeFormatter.ofPattern formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy");
LocalDate.parse("22-12-2015", formatter); //2015-12-22

If you need also information about time(hour,minute,second) use some conversion from LocalDate to LocalDateTime

LocalDate.parse("2015-12-22").atStartOfDay() //2015-12-22T00:00

Answer 6

Months are zero-based in Calendar. So 12 is interpreted as december + 1 month. Use

c.set(year, month - 1, day, 0, 0);