How to count the frequency of a date in R?

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别跟我提以往
别跟我提以往 2021-01-12 11:25

I\'m trying to count the frequency of dates matching in a data frame.

df1 <- data.frame(c(\'1991-01-09\', \'1991-01-11\', \'1991-02-17\'))
df2 <- data.f         


        
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