GLib.Date.get_monday_weeks_in_year

function get_monday_weeks_in_year(year: GLib.DateYear): Number(guint8) {
    // Gjs wrapper for g_date_get_monday_weeks_in_year()
}
  

Returns the number of weeks in the year, where weeks are taken to start on Monday. Will be 52 or 53. The date must be valid. (Years always have 52 7-day periods, plus 1 or 2 extra days depending on whether it's a leap year. This function is basically telling you how many Mondays are in the year, i.e. there are 53 Mondays if one of the extra days happens to be a Monday.)