me I could do it with less code. If I create a range between that last
day of the month and all 7 days prior to it, that last Sunday should be
in there somewhere. When I try to work with ranges, though, and ask for
any results, it returns results for literally every second of every day
in that range! So, can anyone help me to ask Ruby to just give me days
back and not any subdivisions of those days?
t1 = Time.mktime(2007,1,24)
t2 = Time.mktime(2007,1,31)
dates = t1 .. t2
dates.each for |date|
... #puts "date is a Sunday."
end
end
Do it with Date instead of Time.
require 'date'
t1 = Date.new(2007,1,24)
t2 = Date.new(2007,1,31)
dates = t1 .. t2
dates.each do |date|
# your date stuff here
end
Time uses seconds to represents a point in time. Time is fast, because it's really just a thin layer between Ruby and the underlying C libraries.
Date and DateTime use days for their unit, represented by rational numbers (instances of the Rational class). They are a lot slower than Time objects, but have some flexibility that Time doesn't, and the use of Days for their unit means they work well for your application.
If you want to convert a Date into a Time, do this:
Time.local(date.year,date.month,date.day)
Kirk Haines
Don't even deal with the range:
>> jan31 = Date.new(2007,1,31)
=> #<Date: 4908263/2,0,2299161>
>> jan31.strftime "%D, %A"
=> "01/31/07, Wednesday"
>> (jan31 - jan31.wday).strftime "%D, %A"
=> "01/28/07, Sunday"
Date#wday is the number of the weekday: 0=>Sunday, 6=>Saturday
>> (1999..2007).each do |year|
?> jan31 = Date.new(year,1,31)
>> puts (jan31 - jan31.wday).strftime("%D, %A")
>> end; nil
01/31/99, Sunday
01/30/00, Sunday
01/28/01, Sunday
01/27/02, Sunday
01/26/03, Sunday
01/25/04, Sunday
01/30/05, Sunday
01/29/06, Sunday
01/28/07, Sunday
Then start adding!
>> jan31 = Date.new(2007,1,31)
=> #<Date: 4908263/2,0,2299161>
>> next_jan31 = Date.new(2008,1,31)
=> #<Date: 4908993/2,0,2299161>
>> ((jan31-jan31.wday)...(next_jan31-next_jan31.wday)).step(28) do |day>
?> puts day.strftime("%D, %A")
>> end;nil
01/28/07, Sunday
02/25/07, Sunday
03/25/07, Sunday
04/22/07, Sunday
05/20/07, Sunday
06/17/07, Sunday
07/15/07, Sunday
08/12/07, Sunday
09/09/07, Sunday
10/07/07, Sunday
11/04/07, Sunday
12/02/07, Sunday
12/30/07, Sunday
-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
···
On Feb 27, 2007, at 1:15 PM, khaines@enigo.com wrote:
On Wed, 28 Feb 2007, Peter Bailey wrote: