date error while importing date via toad

when i'm importing table data from excell or dbf to oracle from toad for oracle
 , i'm always having error date and eliminated
how to avoid this error
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can you provide a sample excel file and sample table that fails?
NiceMan331Author Commented:
Sorry I asked the question then the office closed , tomorrow morning I will send , thanx
NiceMan331Author Commented:
it was my mistake , i didn't notice date format
please look at the attached image
beside tr_date filed , i open exprssion
then function
now it is ok
is this the best way to add date , or any other one ?
also , in the previous tab of import wezard , it disable the option of changing date format with dbase file only , but with excell it is enabled

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NiceMan331Author Commented:
ok , please close it , but keep the answer for later use
NiceMan331Author Commented:
actually i found the solution before i got i replay , and no other expert contribute in the question
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