When did the Prime Minister recommend the imposition of an Emergency to President Fakhruddin Ali Ahmed?

On the night of 25 June 1975

Answer:  On the night of 25 June 1975
Prime Minister recommended the imposition of Emergency to President Fakhruddin Ali Ahmed on the night of 25 June 1975.

On the night of 25 June 1975, the Prime Minister recommended the imposition of Emergency to President Fakhruddin Ali Ahmed. He issued the proclamation immediately. After midnight, the electricity to all the major newspaper offices was disconnected. In the early morning, a large number of leaders and workers of the opposition parties were arrested. The Cabinet was informed about it at a special meeting at 6 a.m. on 26 June, after all this had taken place.