Dublin to CAT
+1hDublin
ISTSOURCECAT
CATGreen rows indicate typical business hours (9 AM - 5 PM)
IST and CAT on the World Map
The map below highlights the IST (Greenwich Mean Time) and CAT (Central Africa Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
CAT – Central Africa Time
UTC+02:00Central Africa Time (CAT, UTC+02:00) covers Zimbabwe, Zambia, Mozambique, Malawi and neighbouring countries.
- •Central Africa Time is fixed at UTC+02:00 with no daylight saving.
- •CAT matches South Africa Standard Time (SAST) all year.
- •It is the same offset as Central European Time in winter.
- •Harare is level with Johannesburg and one hour ahead of Lagos.
Time Conversion Guide: Dublin to CAT
Dublin runs on Irish Standard Time (IST) at UTC+01:00, currently observing daylight saving time. CAT runs on Central Africa Time (CAT) at UTC+02:00. That puts Dublin 1 hour ahead of CAT — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in Dublin it is 10:00 AM in CAT. Midnight in Dublin is 1:00 AM in CAT.Dublin observes daylight saving time while CAT does not, so the gap narrows or widens by an hour part of the year.
Dublin to CAT time conversion table
| Dublin (IST) | CAT (CAT) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert Dublin to CAT time
- Scheduling a call from Dublin to CAT: a 10:00 AM start in Dublin lands at 11:00 AM in CAT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Dublin and CAT are inside the 9-to-5 working day between 9:00 AM and 4:00 PM IST time (10:00 AM–5:00 PM CAT). That is roughly 7 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Dublin is 9:00 PM in CAT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM IST as the recurring meeting window if you work primarily from Dublin and need CAT colleagues present.
- Dublin: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +1h gap.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
About CAT (Central Africa Time)
Central Africa Time (CAT) is fixed at UTC+02:00 all year across a broad belt of southern and central Africa, including Zimbabwe, Zambia, Mozambique, Malawi, Rwanda, Burundi and the eastern Democratic Republic of the Congo. None of these countries observes daylight saving time, so CAT never shifts. It is the same offset as South Africa Standard Time (SAST) and the winter version of Central European Time, which makes CAT a convenient bridge between African, European and Middle Eastern schedules — Harare is level with Johannesburg all year and one hour ahead of Lagos.
Best time to call between Dublin and CAT
Both Dublin and CAT sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM IST, which is 10:00 AM–5:00 PM CAT. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Dublin and CAT share 7 hours of working-hours overlap (9:00 AM–4:00 PM IST), so scheduling a live meeting is straightforward.
Dublin is 1 hour ahead of CAT (IST UTC+01:00 → CAT UTC+02:00). The shared working window is 9:00 AM–4:00 PM IST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Dublin
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
CAT
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Dublin and CAT?
Dublin (IST, UTC+01:00) is 1 hour ahead of CAT (CAT, UTC+02:00). The gap is currently +1h.
How do I convert Dublin time to CAT time?
Add +1h to Dublin local time. For example, 9:00 AM in Dublin is 10:00 AM in CAT.
What time is it in CAT right now?
CAT uses CAT at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from Dublin.
What is the best time to call CAT from Dublin?
Call between 9:00 AM and 4:00 PM IST — that maps to 10:00 AM–5:00 PM CAT and keeps both parties inside the working day.
Which is ahead, Dublin or CAT?
Dublin is 1 hour ahead of CAT. When it is 12:00 PM in Dublin it is 1:00 PM in CAT.
Do Dublin and CAT use different time zones?
Dublin (Ireland) uses IST at UTC+01:00, while CAT uses CAT at UTC+02:00. The IANA identifiers are Europe/Dublin and Africa/Harare.
Does daylight saving time affect the Dublin–CAT difference?
Yes at the moment: Dublin is on daylight saving time and CAT is not, so the +1h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Dublin's time zone?
IST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use IST, Dublin's zone?
IST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between Dublin and CAT?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between Dublin and CAT?
CAT is +1h from Dublin.
What timezone is Dublin in?
Dublin operates on its local timezone.
What timezone is CAT in?
CAT operates on its local timezone.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
Which cities are in the CAT timezone?
Major cities in the CAT timezone include Harare, Lusaka, Maputo, Lilongwe, Kigali.
What is the UTC offset for CAT?
Central Africa Time (CAT) is at UTC+02:00.
What should I know about the CAT timezone?
Central Africa Time is fixed at UTC+02:00 with no daylight saving. CAT matches South Africa Standard Time (SAST) all year.
When is it midnight in Dublin, what time is it in CAT?
When it is 12:00 AM (midnight) in Dublin (GMT), it is +1h later in CAT (CAT).
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