How to edit DateTime values with microseconds ?

Hello,
In a form application I have a TimeStamp column in the database mapped to a DateTime field with 6 digits for microseconds as in YYYY-MM-DD HH:MM:SS:ssssss
I am not able to enter a value like

2016-01-26 08:05:01:123456

because SC keeps adding a dot every two digits in the microsecond parts as in

2016-01-26 08:05:01:12.34.56

which of course causes an error.

Any idea ?