Does the time difference between Dublin and Rome change during the year?

No. The gap stays at 1h all year.

When is the best time to call Rome from Dublin?

Between 09:00 and 16:00 in Dublin, which is 10:00 to 17:00 in Rome.

Dublin is 1h behind Rome. This gap is the same all year — neither city shifts its clocks relative to the other.

Dublin

Ireland

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Rome

Italy

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A 9-to-5 day in each city overlaps for 7h. That is 09:00–16:00 in Dublin, which is 10:00–17:00 in Rome.

City	Time zone	UTC offset
Dublin · Ireland	Europe/Dublin	UTC+1
Rome · Italy	Europe/Rome	UTC+2

What is the time difference between Dublin and Rome?: Dublin is 1h behind Rome. This gap is the same all year — neither city shifts its clocks relative to the other.
Does the time difference between Dublin and Rome change during the year?: No. The gap stays at 1h all year.
When is the best time to call Rome from Dublin?: Between 09:00 and 16:00 in Dublin, which is 10:00 to 17:00 in Rome.