Question: Is it possible to query on precise (calendar) date-time in DESelect?
Answer: Yes, it is possible. You can choose to filter criteria to query on a particular time using a calendar date picker that allows to enter time as well. For date filters, the following criteria are available: equals to, equals to or greater than, greater than, smaller than, smaller or equals to.
For instance, you would like to query on Orders that were added before 1 October 2019. You can do this by filtering on field Date in the Orders data extension. There, you choose filter smaller than and select Calendar, where you can fill in a concrete date and time.