The Government Information Department announced to hoist the national flag half mast during this period.
South African authorities have also declared the same dates to pay state honor for former President late Nelson Mandela.
Former President Nelson Mandela was 95 years old when he died on Thursday and his funeral will be held next Sunday.
Meanwhile President Mahinda Rajapaksa is also scheduled to leave for South Africa to participate in the Mandela funeral on Sunday.
Update : Monday, 09 December 2013 - 13:02
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Govt declares Dec 10th and 11th as days of mourning to honour Nelson Madela.
Government declares December 10th and 11th as days of mourning to honour late South African President Nelson Mandela; Flags will fly half mast.