as.yyww: Coerce yyww-variable to a valid date.
In rccdates: Date Functions for Swedish Cancer Data

Coerce yyww-variable to a valid date.

1
2
3

as.yyww(x, format_check = TRUE)

as.yyyyww(x, format_check = TRUE)

`x`	a vector that can be coerced to a date of the form yV (yyww) or YV (yyyyww)
`format_check`	Should the format of `x` be checked to be in correct format before we try to change it? `TRUE` by default. Set to `FALSE` if the format is already checked outside the function to avoid multiple checks (that could be time consuming for big data sets).