the calculation procedure version that would execute on 2/15/2020 at 12:00 PM is the one that has the start date time and end date time that include that date and time, and also has the highest priority among the enabled versions. In this case, only version number 4 meets these criteria, as it has a start date time of 2/1/2020 12:00 AM, an end date time of 4/1/2020 12:00 AM, a priority of 1, and is enabled. The other versions either have a different start or end date time, a lower priority, or are not enabled.