She departed from Gibraltar on 22 July to join Convoy GUS 10, which had departed from Bizerta, Algeria on 18 July and arrived at the Hampton Roads, Virginia, United States on 9 August. "Empire Day" departed sailed on to New York, from where she departed on 2 September for the Hampton Roads, where she joined Convoy UGS 17, which departed on 3 September and arrived at Port Said, Egypt on 3 October. She left the convoy at Algiers, where she arrived on 25 September. She departed from Algiers on 16 November to join Convoy GUS 21, which had departed from Port Said on 7 November and arrived at the Hampton Roads on 5 December. Her destination was New York. "Empire Day" departed from New York on 2 January 1944 for the Hampton Roads, where she joined Convoy UGS 29, which arrived at Port Said on 31 January. She then sailed to Suez and Aden, arriving there on 7 February. She then joined Convoy AB 30, which departed that day and arrived at Bombay India on 15 February. She departed from Bombay on 4 March as a member of Convoy BM 88, which arrived at Madras, India on 10 March. She left the convoy at Colombo, Ceylon on 9 March. She departed from Colombo on 25 March with Convoy JC 42, arriving at Calcutta, India on 1 April and returning with Convoy CJ 24, which departed on 15 April and arrived at Colombo on 22 April. Two days later, she departed for Lourenço Marques, Mozambique, where she arrived on 8 May. "Empire Day" departed from Lourenço Marques on 21 May for Durban, South Africa, where she arrived the next day. She departed three days later as a member of Convoy DKA 18, which arrived at Kilindini Harbour, Kenya on 3 June. She departed from Kilindini Harbour on 15 June with Convoy KD 5, which arrived at Durban on 24 June. She left the convoy at Lourenço Marques on 23 June. Carrying a cargo of coal bound for Adem and Port Said, she departed from Lourenço Marques on 31 July as a member of Convoy DK 21A, which dispersed off Beira, Mozambique on 2 August. On 7 August 1944, "Empire Day" was torpedoed and sunk by some east of Dar es Salaam, Tanganyika (). All 34 crew and eight DEMS gunners survived.