Ireland out of step with Cork on standard time until 1856 when Cork gave up its own time.

Before the railways and the telegraph time was not standardised and many areas had time out of keeping with neighbouring areas. Cork held onto its own version of time until 1856 when it fell in with the rest of Ireland.

This is quoted in ‘Layers’ Tom Spadling’s book on Cork Street Signs. 2013 Associated Editions.

The Cork Examiner on the 7th December 1855 ‘that all the principal towns of Ireland with the exception of Cork were using ‘Dublin time’.