Adding dates to time series

additional!!

I now realise that the time series created below is in the wrong order!

clearly the column of dates are not being interpreted as dates by the R. Is
is possible for R to read column one as dates? how can I do this?

dd<-data.frame(prices[,1],prices[,2])

head(dd,3)

prices...1.  prices...2.
1 16/12/2004 0.13675654
2 17/12/2004 0.22967560
3 20/12/2004 0.01841611

ser<-with(dd,zoo(prices[,2],prices[,1]))
plot(ser)
xts <- as.ts(xzoo) 

Error in as.ts(xzoo) : object 'xzoo' not found

xts <- as.ts(ser) 
xts

Time Series:
Start = 1 
End = 732 
Frequency = 1 


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