Derived Column - Date Conversions?!?

It was my understanding earlier that -- it is mandatory to have a Derived Column for a DATE String in a Flat File
to be loaded properly into a table with "datetime" column type

However, i tried running my package with the Input Column as "DT_STR" and the Destination on the table is DATETIME.

Looks like the process went on fine.. Am i missing something here?

My Date Format from the source looks like -- "DD-MON-YY"

Regards
As long as it is in a format the DB understands, going from DT_STR to DateTime is an implicit conversion. So it's converting as it is inserted.