df$ConvertedDate
2017-01-01
2017-01-01
2017-01-01
2017-01-02
2017-01-02

ConvertedDate          Time-Series [1:2] from 01-01-2017 to 01-02-2017: 3 2 ...

df %>%
    table %>%
    data.frame %>%
    rownames <- df %>%
    select(Freq) %>%
    plot()

df          Freq
1  2017-01-01   47
2  2017-01-02  121
3  2017-01-03  125
4  2017-01-04  135