Time.parse

はまった。

>> Time.parse("2011/11/01 am 10:00:00")
=> Thu Nov 10 01:00:00 +0900 2011
>> Time.parse("2011/11/01 am 00:30:00")
ArgumentError: argument out of range
  from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/time.rb:184:in `local'
  from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/time.rb:184:in `make_time'
  from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/time.rb:243:in `parse'
  from (irb):5
>> Time.parse("2011/11/01 am 01:30:00")
=> Tue Nov 01 01:00:00 +0900 2011
>> 

parse 様にいわせればユーザが am, pm 言うなんておかしいだろってこと？
そ、そうかも。

# 2011-11-04