Find the maximum date before the selected period

I have tables as below

1. Sales table with employe code, date, and sales amount
2. Training table with employee code and training date.
3. DateDim table - relationship with date in sales and training table

I would like to summarise the sales per empolyee in the table by month or quarter or year. Also I would like to show the training date if employee attended training in a specific month. and if any training attendence before selected period, then it should show the last training attendence date prior to the selected period.

Sample TrainingTable

Expected result as below. 

I can pull the training date for the respective month, but looking beyond the selected date range is challenging. below is the dax which I used but produces blank.

PreviousTraining = 
CALCULATE(
    MAX(TrainingTable[Training Date]),
    FILTER(
        ALL(TrainingTable),
        TrainingTable[Training Date]<MIN(DateDim[Date]) && TrainingTable[Emp Code] = SELECTEDVALUE(Sales[EmpCode])
        )
)

Please help me with the dax to look beyond the selected period and find the last training date per employee. Thanks in advance.