New DATE_FORMAT may not work in old modules

[webbird]

As we moved from using date() to strftime() in BlackCat, old modules using DATE_FORMAT / TIME_FORMAT print scrambled dates. For the frontend, we have a filter, but it's not perfect at all.

"Workaround" would be to rename the constants used in BC (with CAT_ prefix) and use the old date()-compatible format for the old constants.

Changes needed:

• CAT_Helper_DateTime
• Update script
• Global settings
• User preferences

[webbird]

I'm working on it.