set_dates.rb

require 'flickraw'

FlickRaw.api_key = ''
FlickRaw.shared_secret = ''

@flickr = FlickRaw::Flickr.new 
@flickr.access_token = ''
@flickr.access_secret = ''

# Test if the access token is valid
login = @flickr.test.login
if login.username.nil?
	puts "Something went wrong!"
	exit
end

puts "Signed in as #{login.username}"

photosPerPage = 10

# get all photos
photos = @flickr.people.getPhotos :user_id => "me", :per_page => photosPerPage, :extras => 'description,license,date_upload,date_taken,owner_name,original_format,last_update,geo,tags,machine_tags,o_dims,views,media,path_alias,url_sq,url_t,url_s,url_m,url_z,url_l,url_o'

totalPages = photos.pages
puts "====== Found #{totalPages} pages"

(0..totalPages).each do |page|
  puts "==== Beginning page #{page}"
  
  if page > 0
    photos = @flickr.people.getPhotos :user_id => "me", :page => page, :per_page => photosPerPage, :extras => 'description,license,date_upload,date_taken,owner_name,original_format,last_update,geo,tags,machine_tags,o_dims,views,media,path_alias,url_sq,url_t,url_s,url_m,url_z,url_l,url_o'
  end
  
  photos.each do |p|
		args = {
			'photo_id' => p.id,
			'date_posted' => p.upload_date
		}
		puts "Setting photo date:"
		puts args
		begin
			response = @flickr.photos.setDates args
			puts response.to_hash
		rescue FlickRaw::FailedResponse => e
			puts "Error setting photo date"
			puts e
		end
  end
end