OSIS-355 use strictly_ordered_dates function to compare dates and datetimes
OSIS-355 use strictly_ordered_dates function to compare dates and datetimes

uclouvain/osis_louvain,uclouvain/OSIS-Louvain,uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/osis_louvain,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/osis_louvain,uclouvain/OSIS-Louvain