How to initialize tibble with difftime column

Question

I am getting error

Error in as.POSIXct(time1) : argument "time1" is missing, with no default

when I try to initialize tibble column with difftime class:

tibble(Time_diff = difftime())

Should I treat it as character and convert it to difftime once there're some data?

Answer 1

How about

tibble(Time_diff=structure(NA_real_, class = "difftime"))

which gives

# A tibble: 1 x 1
  Time_diff
  <drtn>   
1 NA       

or

tibble(Time_diff=structure(NA_real_, class = "difftime")) %>% filter(FALSE)

which gives

# A tibble: 0 x 1
# … with 1 variable: Time_diff <drtn>

if you want an empty tibble containing a column of the required class?