The query itself is based on a common misconception, as the noun phrase "Veterans Day" refers specifically to a public holiday in the United States. The United Kingdom does not observe a holiday by this name; its national events for honoring military personnel and commemorating war dead are distinct and use different terminology.
The UK's primary day of commemoration is Remembrance Day, which is observed annually on November 11th, marking the date the armistice was signed to end the First World War. The main public ceremonies, parades, and wreath-laying events take place on Remembrance Sunday, the second Sunday in November. Separately, Armed Forces Day is celebrated on the last Saturday of June. This event is specifically designed to honor the service of living armed forces members, veterans, and their families, and carries a more celebratory tone than the solemnity of Remembrance events.
In essence, the functions of the American holiday are split in the UK. The solemn act of remembering the nation's war dead is the focus of Remembrance Day and Remembrance Sunday in November. The act of honoring and celebrating all service personnel, past and present, is the purpose of Armed Forces Day in June. Therefore, there is no single, direct equivalent date for "Veterans Day" in the UK.
