So erhöhen Sie Daten in A für Schleife in R.

" For loop not a good option and not recommended in R because we loose 
the class of the object and hence the best solution is listed below 
which does the same task"

DF <- data.frame(X = 1:100)
DF$Date <- seq.Date(from = as.Date("2020-03-07"), length.out = nrow(DF), by = 1)
Worrisome Wombat