What is significant about the dates January 29, 1945 and April 10, 1945?

On January 29th, Elie woke up to find that his father had died and was taken away during the night.

I WOKE UP AT DAWN on January 29. On my father's cot there lay another sick person.

April 10th was the day of the evacuation.

ON APRIL 10 , there were still some twenty thousand prisoners in the camp, among them a few hundred children. It was decided to evacuate all of us at once. By evening. Afterward, they would blow up the camp.