GLib.Date.prototype.subtract_years

function subtract_years(n_years: Number(guint)): void {
    // Gjs wrapper for g_date_subtract_years()
}
  

Moves a date some number of years into the past. If the current day doesn't exist in the destination year (i.e. it's February 29 and you move to a non-leap-year) then the day is changed to February 29. The date must be valid.