Formatting of date
Examples
format_date("%d%b%Y")(as.Date("2021-01-01"))
#> [1] "01JAN2021"
format_date("%d%b%Y")(as.POSIXct("2021-01-01 00:00:01", tz = "NZ"))
#> [1] "01JAN2021"
format_date("%d%b%Y")(as.POSIXct("2021-01-01 00:00:01", tz = "US/Pacific"))
#> [1] "01JAN2021"