Rmetrics TimeSeries Class

Hi All R user,
I'm being trouble with converting timeSeries Class on Rmetrics lib.

I use "read.cvs" function to import data.
data is data.frame class. But, I need to convert into timeSeries class.

Below is my example.

# I can't convert into timeSeries class. I don't why ???
Anyone can handle that ????

class(data) = data.frame
class(DXY) = data.frame / class(DXY$Date) = Date

head(data)

         Date lastPrice Vol10 Vol30 Vol90 Vol60 Vol180 Vol260 Vol360
1 2010/01/04    77.525  4.66  9.18  8.21  8.42   9.62  10.78  12.34
2   2010/1/5    77.619  4.38  8.80  8.21  8.37   9.51  10.76  12.34
3   2010/1/6    77.493  3.90  8.83  8.10  8.37   9.49  10.72  12.33
4   2010/1/7    77.913  4.63  8.12  8.12  8.34   9.47  10.73  12.32
5   2010/1/8    77.471  5.49  8.20  8.17  8.44   9.49  10.72  12.33
6  2010/1/11    77.005  6.28  8.48  8.20  8.54   9.51  10.70  12.34

  DXY<- transform(data,Date = as.Date(Date))
head(DXY)

         Date lastPrice Vol10 Vol30 Vol90 Vol60 Vol180 Vol260 Vol360
1 2010-01-04    77.525  4.66  9.18  8.21  8.42   9.62  10.78  12.34
2 2010-01-05    77.619  4.38  8.80  8.21  8.37   9.51  10.76  12.34
3 2010-01-06    77.493  3.90  8.83  8.10  8.37   9.49  10.72  12.33
4 2010-01-07    77.913  4.63  8.12  8.12  8.34   9.47  10.73  12.32
5 2010-01-08    77.471  5.49  8.20  8.17  8.44   9.49  10.72  12.33
6 2010-01-11    77.005  6.28  8.48  8.20  8.54   9.51  10.70  12.34

DXY.S<- as.timeSeries(DXY)
head(DXY.S)

GMT
                     lastPrice Vol10 Vol30 Vol90 Vol60 Vol180 Vol260 Vol360
1970-01-01 04:03:33    77.525  4.66  9.18  8.21  8.42   9.62  10.78  12.34
1970-01-01 04:03:34    77.619  4.38  8.80  8.21  8.37   9.51  10.76  12.34
1970-01-01 04:03:35    77.493  3.90  8.83  8.10  8.37   9.49  10.72  12.33
1970-01-01 04:03:36    77.913  4.63  8.12  8.12  8.34   9.47  10.73  12.32
1970-01-01 04:03:37    77.471  5.49  8.20  8.17  8.44   9.49  10.72  12.33
1970-01-01 04:03:40    77.005  6.28  8.48  8.20  8.54   9.51  10.70  12.34

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