CAT to Ireland
-1hCAT
CATSOURCEIreland
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
CAT and IST on the World Map
The map below highlights the CAT (Central Africa Time) and IST (Greenwich Mean Time) timezone regions across the globe.
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.
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.
Everything You Need to Know About CAT and Ireland Time
CAT runs on Central Africa Time (CAT) at UTC+02:00. Ireland runs on Irish Standard Time (IST) at UTC+01:00, also currently on daylight saving time. That puts CAT 1 hour behind Ireland — a difference of -1h at the current offsets.
In practice, when it is 9:00 AM in CAT it is 8:00 AM in Ireland. Midnight in CAT is 11:00 PM in Ireland.Ireland observes daylight saving time while CAT does not, so the gap narrows or widens by an hour part of the year.
CAT to Ireland time conversion table
| CAT (CAT) | Ireland (IST) | Day |
|---|---|---|
| 12:00 AM | 11:00 PM | previous day |
| 6:00 AM | 5:00 AM | same day |
| 7:00 AM | 6:00 AM | same day |
| 8:00 AM | 7:00 AM | same day |
| 9:00 AM | 8:00 AM | same day |
| 12:00 PM | 11:00 AM | same day |
| 3:00 PM | 2:00 PM | same day |
| 5:00 PM | 4:00 PM | same day |
| 6:00 PM | 5:00 PM | same day |
| 9:00 PM | 8:00 PM | same day |
Why people convert CAT to Ireland time
- Scheduling a call from CAT to Ireland: a 10:00 AM start in CAT lands at 9:00 AM in Ireland, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both CAT and Ireland are inside the 9-to-5 working day between 10:00 AM and 5:00 PM CAT time (9:00 AM–4:00 PM IST). That is roughly 7 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in CAT is 7:00 PM in Ireland makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM CAT" is unambiguous; "3 PM" across a -1h gap is not.
- Block 10:00 AM–5:00 PM CAT as the recurring meeting window if you work primarily from CAT and need Ireland colleagues present.
- Ireland: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
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.
Best time to call between CAT and Ireland
Both CAT and Ireland sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM CAT, which is 9:00 AM–4:00 PM IST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
CAT and Ireland share 7 hours of working-hours overlap (10:00 AM–5:00 PM CAT), so scheduling a live meeting is straightforward.
CAT is 1 hour behind Ireland (CAT UTC+02:00 → IST UTC+01:00). The shared working window is 10:00 AM–5:00 PM CAT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
CAT
Does not observe DST
Ireland
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
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 CAT and Ireland?
CAT (CAT, UTC+02:00) is 1 hour behind Ireland (IST, UTC+01:00). The gap is currently -1h.
How do I convert CAT time to Ireland time?
Add -1h to CAT local time. For example, 9:00 AM in CAT is 8:00 AM in Ireland.
What time is it in Ireland right now?
Ireland uses IST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from CAT.
What is the best time to call Ireland from CAT?
Call between 10:00 AM and 5:00 PM CAT — that maps to 9:00 AM–4:00 PM IST and keeps both parties inside the working day.
Which is behind, CAT or Ireland?
CAT is 1 hour behind Ireland. When it is 12:00 PM in CAT it is 11:00 AM in Ireland.
Do CAT and Ireland use different time zones?
CAT uses CAT at UTC+02:00, while Ireland (Ireland) uses IST at UTC+01:00. The IANA identifiers are Africa/Harare and Europe/Dublin.
Does daylight saving time affect the CAT–Ireland difference?
Yes at the moment: Ireland 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 CAT's time zone?
CAT also covers Harare, Lusaka, Maputo, Lilongwe, Kigali.
Which countries use CAT, CAT's zone?
CAT is used in Zimbabwe, Zambia, Mozambique, Malawi, Rwanda, Burundi, DR Congo (east).
Is there a day difference between CAT and Ireland?
Not normally. The -1h gap only pushes the date over the previous day.
What is the time difference between CAT and Ireland?
Ireland is -1h from CAT.
What timezone is CAT in?
CAT operates on its local timezone.
What timezone is Ireland in?
Ireland operates on its local timezone.
Which countries use CAT (Central Africa Time)?
CAT is used in Zimbabwe, Zambia, Mozambique, Malawi, Rwanda, Burundi, and 1 more countries.
Does CAT observe daylight saving time?
No, CAT does not observe daylight saving time and remains at UTC+02:00 year-round.
What are some interesting facts about CAT?
Central Africa Time is fixed at UTC+02:00 with no daylight saving. CAT matches South Africa Standard Time (SAST) all year.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
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.
When is it midnight in CAT, what time is it in Ireland?
When it is 12:00 AM (midnight) in CAT (CAT), it is -1h later in Ireland (GMT).
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