How to initialize data.frame with column of type POSIXct?

Question

I can initialize a data.frame via

df <- data.frame(a=numeric(), b=character())

But how do I define a column of type POSIXct?

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Answer 1

You can try

df <- data.frame(a=numeric(), b=character(), c=as.POSIXct(character()))

Similarly, you can create a POSIXct column of NAs in a data frame with > 0 rows by creating a new column with as.POSIXct(NA).