Getting below error in time and day split in R

data$eu_indicator-as.factor(data$eu_indicator)
data$hour-hour(data$calc_created)
data$day-date(data$calc_created)  

#data transformation
#datetime: split on date and hours

error msg:::Error in hour(data$calc_created) : could not find function hour

Error in date(data$calc_created) : unused argument (data$calc_created)