[Rails] Accessing datetime elements from hash passed to method

I'm passing hash (called 'params') to a method. Some keys (one of them
is called 'starts_at') in that hash have date as a value (taken from
datetime_select helper). I want to access the date elements like date
only or time only but I'm just out of ideas.

def self.new_meeting(params)
str = params['starts_at(1i)']
puts str
end

This returns nothing.

def self.new_meeting(params)
str = params[:starts_at]
puts str
end

This returns whole date with time.

Ruby 1.9.2
Rails 3.0.7

Can you help a newbie??

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