Iterate over days, starting from x date through an end date

Question

I need to start from, for example, January 1 2013, and "do some things" for each date, resulting in a JSON file for each date.

I have the "do some things" part worked out for a single date, but I'm having a hard time starting at a date and looping through to another end date.

score 96 · Accepted Answer · answered Mar 23 '13 at 18:43

96

You can use ranges :

(Date.new(2012, 01, 01)..Date.new(2012, 01, 30)).each do |date|
  # Do stuff with date
end

or (see @awendt answer)

Date.new(2012, 01, 01).upto(Date.new(2012, 01, 30)) do |date|
  # Do stuff with date
end

answered Mar 23 '13 at 18:43

Intrepidd

Awesome, thanks! How would I define the date format (01012013 - month day year)? – calf Mar 23 '13 at 18:44
My bad @HunterMcMillen. user1034672 I don't get your question. – Intrepidd Mar 23 '13 at 18:46
For each date in the range, I need to eventually print it in this format: `01012103`, coinciding with monthdayyear. – calf Mar 23 '13 at 18:49
Try this : ``sprintf '%02d%02d%d',date.month, date.day, date.year`` – Intrepidd Mar 23 '13 at 18:51
Hmm, just tried that, and nothing's being returned. I replaced the `#Do stuff with date` with it. – calf Mar 23 '13 at 19:06
``sprintf`` only creates a string, call ``printf`` if you want to actually print the string – Intrepidd Mar 23 '13 at 19:08

score 31 · Answer 2 · answered Mar 23 '13 at 18:47

31

You could use:

 first.upto(last) do |date|

where first and last are Date objects.

See what I did here in a project of mine, for example.

answered Mar 23 '13 at 18:47

awendt

2 Answers2