Time.parse differences between ruby 1.8 and 1.9

ruby time parsing

Time.parse('3-31-2011')
Time.parse('31-3-2011')
Time.parse('3/31/2011')
Time.parse('31/3/2011')


ruby-1.8.7-p302 > Time.parse('3-31-2011')
ArgumentError: argument out of range
        from /Users/mark/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/time.rb:184:in `local'
        from /Users/mark/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/time.rb:184:in `make_time'
        from /Users/mark/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/time.rb:243:in `parse'
        from (irb):39
ruby-1.8.7-p302 > Time.parse('31-3-2011')
 => Thu Mar 31 00:00:00 -1000 2011 
ruby-1.8.7-p302 > Time.parse('3/31/2011')
 => Thu Mar 31 00:00:00 -1000 2011 
ruby-1.8.7-p302 > Time.parse('31/3/2011')
ArgumentError: argument out of range
        from /Users/mark/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/time.rb:184:in `local'
        from /Users/mark/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/time.rb:184:in `make_time'
        from /Users/mark/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/time.rb:243:in `parse'
        from (irb):42
ruby-1.8.7-p302 > 

---

ruby-1.9.2-p0 > Time.parse('3-31-2011')
ArgumentError: argument out of range
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/time.rb:198:in `local'
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/time.rb:198:in `make_time'
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/time.rb:267:in `parse'
        from (irb):14
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `<main>'
ruby-1.9.2-p0 > Time.parse('31-3-2011')
 => 2011-03-31 00:00:00 -1000 
ruby-1.9.2-p0 > Time.parse('3/31/2011')
ArgumentError: argument out of range
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/time.rb:198:in `local'
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/time.rb:198:in `make_time'
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/time.rb:267:in `parse'
        from (irb):16
        from /Users/mark/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `<main>'
ruby-1.9.2-p0 > Time.parse('31/3/2011')
 => 2011-03-31 00:00:00 -1000 
ruby-1.9.2-p0 > 

thanks for this.