Count number of dates values in each cell and retain larger value only

Dear all,
I have a column with multiple data values in each cell.
Count of date values varies from 1 to 7 max.
I need a code to retain only maximum of these date values in each cell and delete rest.

Please note: Date values are separated with single spaces and colon as well.

2016/05/25
2016/05/25,2016/05/25
2016/05/25 2016/05/25
2016/05/25 2016/05/25
2016/05/25 2016/05/25
2016/05/24 2016/05/24 2016/05/24 2016/06/07,2016/06/07
2016/04/28 2016/04/28 2016/05/12
2016/04/28,2016/04/28
2016/04/28,2016/04/28
2016/04/28 2016/04/28

Please help to improve my logic in these kind of cases.
Thanks

Is it not possible to achieve using VBA code..?