Is there an elegent way to merge two data frame by timestamp in R?

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再見小時候
再見小時候 2021-01-23 18:55

Suppose I have two data frame, df1 and df2.

df1 <- data.frame(value = 1:5, timestamp = as.POSIXct( c( "2020-03-02 12:20:00", "2020-03-02 12:20:0         


        
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