Looking for Hart of Bombay New Zealand

looking for any family or information on robert hart, born bombay, new zealand on 6/4/1901, and died 2/6/1960 in adelaide. married doris may alder,lived in adelaide, south australia. don,t know anything of his family, only his fathers name was solomon. The only Robert Hart I am able to trace was born either 1889 or 1891, this persons birth date is the same, but wonder why the dates could be so different? V