Follow-up from "Multi date column"

The following discussion from !281 (merged) should be addressed:

• @bert.palm started a discussion: (+1 comment)

  nice solution 🍰

  ---

  maybe, if you like the idea, we could use | as delimiter instead of ' '(space). With that the user might have a better chance to guess where the formats were concatenated in case of error or warning.

  %d/%m/%y %H:%M:%S
  vs. 
  %d/%m/%y | %H:%M:%S
  or maybe
  %d/%m/%y + %H:%M:%S