I'm really new here and I'm really new in programming language like R. 
I would like to download 3 time series, choose 2 columns (dates and closing price) from each of them and then merge them into one. Merging them is my problem -- some dates are copied like here:

<http://prntscr.com/avz7o6.jpg>

I tried to use merge.xts() instead of merge() and change .xts into data.frame but it doesn't work.

My code:

```
#install packages quantmod i Quandl
install.packages(c("quantmod","Quandl"))
library('quantmod')
library('Quandl')

#download data (.xts) using Quandl
Wine<-Quandl("LSE/WINE",type="xts")

#download data from Yahoo!Finance (.xts)
Rennova.Health<-getSymbols("RNVA")

#download data from stooq.pl and change them into xts
data<-read.csv("http://stooq.pl/q/d/l/?s=EUR&i=d",header=TRUE)   
EUR<-xts(data[,-1],order.by=as.POSIXct(data[,1])) 

#choose closing price and name them 
zamkniecie1<-Wine$"Last Close"
zamkniecie2<-RNVA$RNVA.Close
zamkniecie3<-EUR$Zamkniecie

#MARGE! into one
all.in.one<-merge(zamkniecie1, zamkniecie2, zamkniecie3)

```

Thanks for your help!