日付の比較

簡単な比較。

% irb
irb(main):001:0> require 'date'
=> true
irb(main):002:0> from = Date::strptime('2008-01-01', '%Y-%m-%d')
=> #<Date: 4908933/2,0,2299161>
irb(main):003:0> to = Date::strptime('2008-01-02', '%Y-%m-%d')
=> #<Date: 4908935/2,0,2299161>
irb(main):004:0> sametime = Date::strptime('2008-01-01', '%Y-%m-%d')
=> #<Date: 4908933/2,0,2299161>
irb(main):005:0> from < to
=> true
irb(main):006:0> to < from
=> false
irb(main):008:0> from == sametime
=> true
irb(main):009:0>