Yesterday I’ve encountered the irritating date problem in Rails. Please remember to restart Webrick when you change the date conversion constants or time conversion constants with the ‘merge!’ method:

ActiveSupport::CoreExtensions::Date::Conversions::DATE_FORMATS.merge!(
:default => "%d-%m-%Y"
)

On reload it merges the array again… You can never remove the ‘:default’ date with a merge…
*sigh*

This tip can save you a whole lot of time, because reloading doesn’t work