12.1 lubridate

library(lubridate)
## 
## Attaching package: 'lubridate'
## The following object is masked from 'package:base':
## 
##     date

ymd('2018-06-06')
## [1] "2018-06-06"

dt_str <- '2018-06-06'
class(dt_str)
## [1] "character"

dt_dt <- ymd(dt_str)
class(dt_dt)
## [1] "Date"

mdy('June 6, 2018')
## [1] "2018-06-06"

dmy('06-06-2018')
## [1] "2018-06-06"

ymd(20190606)
## [1] "2019-06-06"

ymd_hms('2018-06-06 10:33:55', tz = 'EDT')
## [1] "2018-06-06 14:33:55 EDT"