According to the "Sterbebücher" (death records) of Auschwitz, David Hartog Cohen was murdered on 10 September 1942. This date is different from the official date of death as determined by the Dutch Ministry of Justice after the war. For the time being, the website joodsmonument.nl, list only the dates of death, as published by the Ministry of Justice.
Sterbebuch Auschwitz (death record)
The official certificate of death by the Dutch Ministry of Justice nr. 269 d.d. 20-7-1950 - register A43-folio47