Module: ICU::Util::Date

Defined in:
lib/icu_ratings/util.rb

Class Method Summary collapse

Class Method Details

.age(born, date = ::Date.today) ⇒ Object

Returns the difference of two dates:

age(born, date)  # age in years at the given date (Float)
age(born)        # age in years now (today)

Internally it uses parsedate! so can throw a exception if an invalid date is supplied.



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# File 'lib/icu_ratings/util.rb', line 37

def self.age(born, date=::Date.today)
  born = parsedate!(born)
  date = parsedate!(date)
  date.year - born.year + (date.yday - born.yday) / 366.0
end

.parsedate!(date) ⇒ Object

Parses strings into date objects, interpreting nn/nn/nnnn as dd/mm/yyyy. It raises an exception on error.

parsedate!('1955-11-09')       # => Date (1955-11-09)
parsedate!('02/03/2009')       # => Date (2009-03-02)
parsedate!('02/23/2009')       # => Date (2009-02-23)
parsedate!('16th June 1986')   # => Date (1986-06-16)
parsedate!('not a date')       # exception raised

Note that the parse method of the Date class behaves differently in Ruby 1.8.7 and 1.9.1. In 1.8.7 it assumes American dates and will raise ArgumentError on “30/03/2003”. In 1.9.1 it assumes European dates and will raise ArgumentError on “03/30/2003”.



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# File 'lib/icu_ratings/util.rb', line 19

def self.parsedate!(date)
  return date.clone if date.is_a?(::Date)
  string = date.to_s.strip
  raise "invalid date (#{date})" unless string.match(/[1-9]/)
  string = [$3].concat($2.to_i > 12 ? [$1, $2] : [$2, $1]).join('-') if string.match(/^(\d{1,2}).(\d{1,2}).(\d{4})$/)
  begin
    ::Date.parse(string, true)
  rescue
    raise "invalid date (#{date})"
  end
end