It can also happen that deaths are registered, but the date of death is unknown — this is the case for Sweden.
The date associated with a death might refer to when the death occurred or to when it was registered. This varies by country.Death counts by date of registration can vary significantly irrespectively of any actual variation in deaths, such as from registration delays or the closure of registration offices on weekends and holidays. It can also happen that deaths are registered, but the date of death is unknown — this is the case for Sweden. 14