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

No. The gap stays at 1h all year.

When is the best time to call Paris from Dublin?

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

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

Dublin

Ireland

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Paris

France

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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 Paris.

City	Time zone	UTC offset
Dublin · Ireland	Europe/Dublin	UTC+1
Paris · France	Europe/Paris	UTC+2

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