and raises this error during the execution of the tests :

Multiple keywords with name 'Parse Ngsild Date' found. Give the full name of the keyword you want to use:
    assertionUtils.Parse Ngsild Date
    dateTimeUtils.Parse Ngsild Date

- ensure expected is on the left, and actual is on the right
- display the difference (if any) as part of the check (not in a separate keyword, less readable)
- pretty print the difference when one is found