Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

CEST to IRST

+1h 30m

CEST

CESTSOURCE

UTC+02:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH01

MM30

13:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

CEST

IRST

12:00 AM

1:30 AM

2:00 AM

3:30 AM

4:00 AM

5:30 AM

6:00 AM

7:30 AM

8:00 AM

9:30 AM

10:00 AM

11:30 AM

12:00 PM

1:30 PM

2:00 PM

3:30 PM

4:00 PM

5:30 PM

6:00 PM

7:30 PM

8:00 PM

9:30 PM

10:00 PM

11:30 PM

Green rows indicate typical business hours (9 AM - 5 PM)

CEST and IRST on the World Map

The map below highlights the CEST (Central European Summer Time) and IRST (Iran Standard Time) timezone regions across the globe.

CEST Zone

→

IRST Zone

Explore all world timezones interactively →

CEST – Central European Summer Time

UTC+02:00

Central European Summer Time (CEST) is the daylight saving time in Central Europe, 2 hours ahead of UTC.

Countries in CEST

GermanyFranceItalySpainNetherlandsBelgiumAustriaSwitzerlandPolandSwedenNorway

Major Cities in CEST

ParisBerlinRomeMadridAmsterdamViennaStockholm

Key Facts about CEST

•CEST runs from the last Sunday of March to the last Sunday of October.
•The EU has voted to abolish clock changes but implementation has been delayed.
•CEST shares the same offset as EET (UTC+02:00).

Daylight Saving:Yes – switches to CET

Learn more about CEST on Wikipedia

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

CEST to IRST Time Difference – Complete Guide

CEST runs on Central European Summer Time (CEST) at UTC+02:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts CEST 1 hour 30 minutes ahead of IRST — a difference of +1h 30m at the current offsets.

In practice, when it is 9:00 AM in CEST it is 10:30 AM in IRST. Midnight in CEST is 1:30 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

CEST to IRST time conversion table

CEST (CEST)	IRST (IRST)	Day
12:00 AM	1:30 AM	same day
6:00 AM	7:30 AM	same day
7:00 AM	8:30 AM	same day
8:00 AM	9:30 AM	same day
9:00 AM	10:30 AM	same day
12:00 PM	1:30 PM	same day
3:00 PM	4:30 PM	same day
5:00 PM	6:30 PM	same day
6:00 PM	7:30 PM	same day
9:00 PM	10:30 PM	same day

Why people convert CEST to IRST time

Scheduling a call from CEST to IRST: a 10:00 AM start in CEST lands at 11:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both CEST and IRST are inside the 9-to-5 working day between 9:00 AM and 3:30 PM CEST time (10:30 AM–5:00 PM IRST). That is roughly 6 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in CEST is 9:30 PM in IRST makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM CEST" is unambiguous; "3 PM" across a +1h 30m gap is not.
Block 9:00 AM–3:30 PM CEST as the recurring meeting window if you work primarily from CEST and need IRST colleagues present.

About CEST (Central European Summer Time)

Central European Summer Time (CEST) is observed from the last Sunday of March to the last Sunday of October across most of Europe. During CEST, clocks are 2 hours ahead of UTC. The EU has debated abolishing seasonal clock changes since 2019.

About IRST (Iran Standard Time)

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

Best time to call between CEST and IRST

Both CEST and IRST sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM CEST, which is 10:30 AM–5:00 PM IRST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

CEST and IRST share 6 hours of working-hours overlap (9:00 AM–3:30 PM CEST), so scheduling a live meeting is straightforward.

CEST is 1 hour 30 minutes ahead of IRST (CEST UTC+02:00 → IRST UTC+03:30). The shared working window is 9:00 AM–3:30 PM CEST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

CEST

☀ Currently in DST

Standard: UTC+01:00 · DST: UTC+02:00

Clocks fall back on Sun, Oct 25, 2026

IRST

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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between CEST and IRST?

CEST (CEST, UTC+02:00) is 1 hour 30 minutes ahead of IRST (IRST, UTC+03:30). The gap is currently +1h 30m.

How do I convert CEST time to IRST time?

Add +1h 30m to CEST local time. For example, 9:00 AM in CEST is 10:30 AM in IRST.

What time is it in IRST right now?

IRST uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h 30m offset from CEST.