copy_to() of dplyr lib returning previous date

[Mayura]

Hi
I am trying to convert date from string to date format using R with
as.date() as shown below:
dfTest <- data.frame(StringDate=c("2020-12-01","2020-12-02"),
DateDate=as.Date(c("2020-12-01","2020-12-02")))
dfTest
StringDate DateDate
1 2020-12-01 2020-12-01
2 2020-12-02 2020-12-02

The above command gives desired output:

but when i use copy_to() as shown below , previous date are returned which
is very strange:

sdfTest <- copy_to(sc, dfTest)
sdfTest
#Source: spark [?? x 2]
StringDate DateDate

1 2020-12-01 2020-11-30
2 2020-12-02 2020-12-01



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