isoweekStart function

Calculate the start date of a given ISO week

This function takes a vector of ISO week numbers (of the form YYYYWW) and returns a Date vector with the first Monday of each week. It is essentially the inverse function of isoweek.

isoweekStart(x)

Arguments

• x: A numeric vector of ISO week numbers (of format YYYYWW)

Returns

A vector of class Date and length equal to x, containing the start date (first Monday) of each ISO week.

Examples

isoweekStart(201740) # Start of 2017-18 influenza surveillance
isoweekStart(isoweek(Sys.Date()))