sql server - SSIS Issue with date conversion -

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i'm working on importing csv db. data should work, it's data application used through dblink have csv upgrade.
dates this: 4/30/2001
tried simple import numbers , strings, , got error, did derived column.
derived column works on dates not null (formula (dt_date)dte)
derived column failed on dates can contain nulls. tried update formula (isnull(edte) ? null(dt_date) : (dt_date)edte). no success, still error:

[flat file source - o1 [6743]] error: data conversion failed. data conversion column  "edte" returned status value 2 , status text "the value not converted because of  potential loss of data.".

originally, in flat file source, dates set type date, , got error before got derived column. i've changed string, , makes derived column, both boxes red. here's error: 

[derived column 1 [17270]] error: ssis error code dts_e_inducedtransformfailureonerror.   "component "derived column 1" (17270)" failed because error code 0xc0049063 occurred,  , error row disposition on "input column "edte" (17809)" specifies failure on error.  error occurred on specified object of specified component. there may error messages posted before more information failure.

has seen this? importing data in wrong?

i found solution. import date string. using derived column, use formula convert it: rtrim([t-dte]) == "" ? null(dt_date) : (dt_date)[t-dte]


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