there is some flexibility in changing the standard date format of Daily Note names, but not a lot… also: agree an error warning would be nice, esp. as Daily Notes plugin-settings for date format apply to the file name, AND also to the {{date}} variable in the specified Template file!! (to use a different format in the template file, even if that same format is specified in the Template plugin settings, the Daily Notes behavior must be specifically overridden in the relevant template file, as instructed regarding date formats in the Daily Notes plugin doc)