library(gtools)

today <- Sys.Date()
tenweeks <- seq(today, length.out = 10, by = "1 week")

df1 <- data.frame(dates = tenweeks, chars = letters[1:10], ints = 1:10, numeric = 1.1:10.1)
df2 <- data.frame(chars = letters[11:20], ints = 11:20, numeric = 11.1:20.1)

smartbind(df1, df2)