Board Thread:The Roundhouse/@comment-26828130-20170519211131/@comment-26828130-20170519214949

The template has to compare, so full info is still required

The input is YYYY|MM|DD|YYYY|MM|DD (based on 2 Date templates in tandem), if the first parameter (year) is left out, it will see the parameter for month as year. Changing the format to DD|MM|YYYY will make things worse, as Template:Date also has to be changed to that format to avoid confusion, and really ALL pages that use the templates have to be re-edited, leaving the format as it is requires no change at all.