Question

I’ve been searching for hours now and I just can’t find the right answer.
Hope you can help me out.

Ruby: 1.9.3p194
Rails: 3.2.8

Goal:

1.9.3p194 :001 > get_weeknumbers_in_month 1, 2012
=> [1, 2, 3, 4]
1.9.3p194 :002 > get_weeknumbers_in_month 2, 2012
=> [5, 6, 7, 8]
1.9.3p194 :003 > get_weeknumbers_in_month 3, 2012
=> [9, 10, 11, 12, 13]
1.9.3p194 :004 > get_weeknumbers_in_month 4, 2012
=> [14, 15, 16, 17]

So, I actually want an array of calendar week numbers when the method get_weeknumbers_in_month is called.

Research:

To get the month numbers from a date:

DateTime.parse("2012-01-10").month
=> 1

To get the number of days in a month:

Time::days_in_month(1, 2012)
=> 31

To get the calendar week number of a date:

DateTime.parse("2012-04-12").strftime("%W").to_i
=> 15

Can someone please help me with this issue?

Thanks in advance.

Answer 1

If I understand, you’ve almost done!
the last is to calculate first and last dates for month, isn’t it?
So something like next may work (not tested)

def get_weeknumbers_in_month(month, year)
  first_week_num = Date.new(year,month,1).strftime("%U").to_i
  last_week_num = Date.new(year,month,1).end_of_month.strftime("%U").to_i
  (first_week_num..last_week_num).to_a
end