Problems Dating....

I'm trying to convert a column in a data frame with dates from a
"Factor" type to a "Date Object" but I am encountering and error. (I am
having trouble plotting an x,y scatter and I suspect it's something with
my data format). I have a table with two columns and 8,000 rows. 

dsort=read.delim("C:\\Documents and Settings\\E066582\\My

Documents\\R\\R-2.13.0\\bin\\dsort.txt")



"dsort"                                                #name of
data.frame

colnames(dsort)[1]                     #name of column 1

[1] "Date"

colnames(dsort)[2]                     #name of column 2

[1] "Qty"

class(dsort$Date)                         #checked data type of column

"Date" and it came back as a factor

[1] "factor"

Date2=as.Date(dsort$Date)    #attempt at changing the data type from a

factor to a date object (see error below).

Error in charToDate(x) : 

 character string is not in a standard unambiguous format



Dates in my table are listed in "3/4/2007" format. 

StatBat2

as.Date("3/4/2007", format = "%m/%d/%Y")