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Why does en_GB say January 1 is the 52nd week of the year?

It turns out that week-year using the wwjava date format as a string is 52 for January 1, 2011, when the language standard en_GB. Here is the proof (using scala REPL, although I could do it with a Java program)

First find my locales

scala> val en = java.util.Locale.getAvailableLocales.find(_.toString == "en") getOrElse error("no en")
en: java.util.Locale = en

scala> val en_GB = java.util.Locale.getAvailableLocales.find(_.toString == "en_GB") getOrElse error("no en_GB")
en_GB: java.util.Locale = en_GB

Now do January 1st

scala> import java.util.Calendar; import Calendar._
import java.util.Calendar
import Calendar._

scala> Calendar.getInstance
res23: java.util.Calendar = java.util.GregorianCalendar[time=1300708839128,....]

scala> res23.set(MONTH, JANUARY); res23.set(DAY_OF_MONTH, 1)

scala> val firstJan = res23.getTime
firstJan: java.util.Date = Sat Jan 01 12:00:39 GMT 2011

Now declare a method for printing depending on the language:

scala> def weekInLocale(l : java.util.Locale) = { java.util.Locale.setDefault(l); new java.text.SimpleDateFormat("ww").format(firstJan) }
weekInLocale: (l: java.util.Locale)java.lang.String

Now call it:

scala> weekInLocale(en)
res24: java.lang.String = 01

scala> weekInLocale(en_GB)
res26: java.lang.String = 52

Is it correct?

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2 answers

From ISO8601, week 1 is defined as the week of January 4th. From 2011-01-01 it was Saturday, this applies to the previous week.

Since there is no week 0, then 2011-01-01 can also be written as 2010-W52-6.

, , . Wikipedia:

.

, 1.

+9

1 2011 . W52 .
ISO 01

. . Week_numbering

+3

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