This is a postcard of William Street in Galway City, circa 1930. The keen eye will see "DUBLIN TIME" underneath the clock at Dillon's Jewellers (the building on the right of the photo with the striped awning). In the past, Galway, like other Irish towns, operated according to local time, which was relative to its distance from Greenwich. Dublin time was twenty-five minutes behind London and Galway time was eleven and a half minutes behind Dublin.
With the arrival of the railways, this became problematic for timetables as the local time at one end of the line could differ significantly from that at the other. As Irish trains operated to time in the metropolis – Dublin time – Galway had to conform.
If you've visited Galway City, you may have seen this building which, at the time of this writing, is occupied by the Galway Camera shop. The clock there still says "Dublin Time," no doubt as a nod to the past.