colnames(absence.google) <- c("timestamp", "unique.name", "date.absent")
absence.google$date.absent <- as.Date(absence.google$date.absent, format="%m/%d/%Y")
absence.google$reported <- TRUE
colnames(absence.google) <- c("timestamp", "unique.name", "date.absent")
absence.google$date.absent <- as.Date(absence.google$date.absent, format="%m/%d/%Y")
absence.google$reported <- TRUE