contains wouldn't work, but intersects would 
...| 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 |...
                  (------------)     log
                            (----]   hour
                            (--)     intersection

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In reply to Re^4: Check if Date interval contains Hour X by ikegami
in thread Check if Date interval contains Hour X by gulden

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