Basic Start Date and Scheduled Start Date on Production Orders

Hi,

I have created Prd Order and identify the cause for why when the order start date 06/14/2016 and with forward scheduling total Qty 1 or 2, then schedule the Order and check the dates its become 06/13/2016. It was happening total Qty 1 or 2 only,

If we give 3 or more dates are same like 06/14/2016 no change.

If we use Forward in Time Scheduling and do the same activities for Qty 1 or 2 the desired result after scheduling is achieved Basic Start Date and Scheduled Start Date.

Please advice this.