as_date() and as_datetime()

• Most useful for offset from “Unix Epoch”, 1970-01-01 00:00:00 UTC
  • as_date(days)
  • as_datetime(seconds)

as_date(365 * 10 + 2) # 2 leap years

## [1] "1980-01-01"

as_datetime(10 * 60 * 60)

## [1] "1970-01-01 10:00:00 UTC"