How can I get the number of days in a year using JodaTime?

Question

I tried the following to no avail:

new Period(Years.ONE).getDays();

new Period(1, 0, 0, 000).getDays();

The answer, I obviously want 365.

Answer 1

If you want the actual number of days for a given year:

int year = 2012;
LocalDate ld = new LocalDate(year,1,1);
System.out.println(Days.daysBetween(ld,ld.plusYears(1)).getDays());

Of course, this returns 365 or 366 ... usually:

int year = 1582;
LocalDate ld = new LocalDate(year,1,1,GJChronology.getInstance());
System.out.println(Days.daysBetween(ld,ld.plusYears(1)).getDays());
// year 1582 had 355 days

Answer 2

The answer you want is not explicit 365. This either 365, or 366, you do not consider leap years in your example.

Detecting a leap year and simply hard-coding it with a ternary statement would be unacceptable for any reason?

final DateTime dt = new DateTime();
final int daysInYear = dt.year().isLeap() ? 366 : 365;

Of course, this will give you the number of days in the current year, how to get the number of days in another year is trivial and an exercise for the reader.

Answer 3

TL;DR

java.time.Year.of( 2017 ).length()

java.time

Joda-Time, , java.time.

java.time.Year .

Year year = Year.of( 2017 );

, , Leap Year .

int countDaysInYear = year.length() ;
boolean isLeapYear = year.isLeap() ; // ISO proleptic calendar system rules.

---

java.time

java.time Java 8 . legacy , java.util.Date, Calendar SimpleDateFormat.

Joda-Time, , java.time.

, . Oracle. Qaru . JSR 310.

java.time?

• Java SE 8 SE 9
  • .
  • Java API .
  • Java 9 .
• Java SE 6 SE 7
  • java.time Java 6 7 ThreeTen-Backport.
• Android
  • ThreeTenABP ThreeTen-Backport ( ) Android.
  • . ThreeTenABP....

The ThreeTen-Extra project extends java.time with additional classes. This project is a proof of possible future additions to java.time. Here you can find useful classes, such as Interval, YearWeek, YearQuarterand longer .

Answer 4

new DateTime (). year (). toInterval (). toDuration (). getStandardDays ();