根据ISO 8601生成周/年的列表

Question

I try to generate a list of days with their week number (defined by ISO 8601 ) accordingly :

mydate='2012-12-25 02:26:55.983'
for (i=1;i<365;i++)
{
  mydateAsDate=new Date().parse('yyyy-MM-dd H:mm:ss.S',mydate)+i;
  println 'Week ' + mydateAsDate.format('w') + ' => ' + mydateAsDate.format('dd.MM.yyyy');
}

This works but I would like to get the year also like this:

Week 1-2013

I can't figure out which year information I should take.

Any idea?

Answer 1

As Jon Skeet said, I'd recommend using Joda-Time .

If you do, the following should fix your issues:

mydate= new DateTime(2012,12,25)
yearLater = myDate.plusYears(1)
while(myDate < yearLater){
  println "Week ${myDate.weekOfWeekyear} - ${myDate.year}"
  myDate = myDate.plusDays(1)
}

Answer 2

Not sure I understand, but you mean like:

String startDateString = '2012-12-25 02:26:55.983'
Date startDate = Date.parse( 'yyyy-MM-dd H:mm:ss.S', startDateString )
(1..364).each { i ->
    println( (startDate++).format( "dd.MM.yyyy : 'Week' w'-'yyyy" ) )
}

Answer 3

I got it : SimpleDateFormat delivers the right week year information when using the YYYY format

thus this is only available in java 1.7

thanks for your responses though !

cheers