LoadError: no such file to load -- date/format
  require at org/jruby/RubyKernel.java:944
  require at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:55
    <top> at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/date.rb:196
  require at org/jruby/RubyKernel.java:944
   (root) at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
    <top> at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:55
  require at org/jruby/RubyKernel.java:944
   (root) at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/time.rb:3
    <top> at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
  require at org/jruby/RubyKernel.java:944
  require at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:55
    <top> at /home/ldb/ldb-ruby/lib/ruby-ldb/ldb.rb:1