Months between and Days Beween

library(lubridate)

date1_format = as.character(ymd(20150221));date1_format 

## [1] "2015-02-21"

date2_format = as.character(ymd(20190623));date2_format 

## [1] "2019-06-23"

month_between_date_sk = interval(date1_format,date2_format) %/% months(1);month_between_date_sk

## Note: method with signature 'Timespan#Timespan' chosen for function '%/%',
##  target signature 'Interval#Period'.
##  "Interval#ANY", "ANY#Period" would also be valid

## [1] 52

days_between_date_sk = interval(date1_format,date2_format) %/% days(1);days_between_date_sk

## [1] 1583