The Monday that starts an ISO week — isoyearweek_week_start • csalert

Returns the Monday that starts each ISO week, as a Date. Every delay in a reporting triangle counts days from this Monday.

Usage

isoyearweek_week_start(isoyearweek)

Arguments

isoyearweek: A character vector of ISO weeks, written "YYYY-WW".

Value

A Date vector as long as isoyearweek, with NA for a value that is not an ISO week in cstime::dates_by_isoyearweek.

See also

vignette("pipeline", package = "csalert"), which counts every delay and age in days from this Monday.

Other reporting triangle functions: csfmt_reporting_triangle_v3(), reporting_triangle_matrix()

Examples

# ISO week 2026-01 starts on Monday 2025-12-29
isoyearweek_week_start(c("2026-01", "2026-02"))
#> [1] "2025-12-29" "2026-01-05"

# a report on 2026-01-08 has delay day 10 in reference week 2026-01
as.Date("2026-01-08") - isoyearweek_week_start("2026-01")
#> Time difference of 10 days

# a string that is not an ISO week gives NA
isoyearweek_week_start("2026-99")
#> [1] NA