Time in the Republic of Ireland to be the legal time for Great Britain. After the Easter Rising, the time difference between Ireland and Britain was found inconvenient for telegraphic communication and the Time (Ireland) Act, 1916 provided that Irish time would be the same as British time, from 2:00 am Dublin Mean Time on Sunday 1 October 1916. Summer time (daylight saving time) had been introduced in May 1916 across the United Kingdom as a temporary efficiency measure for the First World War, and the changeover from Dublin time to Greenwich time was simultaneous with the changeover from summer time to winter time. John Dillon
Irish Citizen Army authorities tolerated the open drilling and bearing of arms by the ICA, thinking that to clamp down on the organisation would provoke further unrest. A small group of IRB conspirators within the Irish Volunteers movement had started planning a rising. Worried that Connolly would embark on premature military action with the ICA, they approached him and inducted him into the IRB's Supreme Council to co-ordinate their preparations for the armed rebellion which became known as the Easter Rising. On Monday, 24 April 1916, 220 members of the ICA (including 28 women) took part in the Easter Rising, alongside a much