Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Vietnam to SAST

-5h

Vietnam

ICTSOURCE

UTC+07:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

SAST

UTC+02:00

HH07

MM00

07:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Vietnam

SAST

12:00 AM

7:00 PM-1

2:00 AM

9:00 PM-1

4:00 AM

11:00 PM-1

6:00 AM

1:00 AM

8:00 AM

3:00 AM

10:00 AM

5:00 AM

12:00 PM

7:00 AM

2:00 PM

9:00 AM

4:00 PM

11:00 AM

6:00 PM

1:00 PM

8:00 PM

3:00 PM

10:00 PM

5:00 PM

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

ICT and SAST on the World Map

The map below highlights the ICT (Indochina Time) and SAST (South Africa Standard Time) timezone regions across the globe.

ICT Zone

→

SAST Zone

Explore all world timezones interactively →

ICT – Indochina Time

UTC+07:00

Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.

Countries in ICT

ThailandVietnamCambodiaLaosIndonesia (WIB)

Major Cities in ICT

BangkokHo Chi Minh CityHanoiJakartaPhnom PenhVientiane

Key Facts about ICT

•Bangkok is one of the most visited cities in the world.
•ICT is 12 hours ahead of EST.
•Thailand, Vietnam, and Cambodia all share ICT.

Daylight Saving:No – UTC+07:00 year-round

Learn more about ICT on Wikipedia

SAST – South Africa Standard Time

UTC+02:00

South Africa Standard Time (SAST) is the time zone for South Africa and neighboring countries, 2 hours ahead of UTC.

Countries in SAST

South AfricaLesothoEswatini

Major Cities in SAST

JohannesburgCape TownDurbanPretoriaPort Elizabeth

Key Facts about SAST

•South Africa does not observe daylight saving time.
•SAST is the same offset as EET and Israel Standard Time.
•The Johannesburg Stock Exchange (JSE) is Africa's largest.

Daylight Saving:No – UTC+02:00 year-round

Learn more about SAST on Wikipedia

Comparing Time Zones: Vietnam and SAST

Vietnam runs on Indochina Time (ICT) at UTC+07:00. SAST runs on South Africa Standard Time (SAST) at UTC+02:00. That puts Vietnam 5 hours behind SAST — a difference of -5h at the current offsets.

In practice, when it is 9:00 AM in Vietnam it is 4:00 AM in SAST. Midnight in Vietnam is 7:00 PM in SAST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Vietnam to SAST time conversion table

Vietnam (ICT)	SAST (SAST)	Day
12:00 AM	7:00 PM	previous day
6:00 AM	1:00 AM	same day
7:00 AM	2:00 AM	same day
8:00 AM	3:00 AM	same day
9:00 AM	4:00 AM	same day
12:00 PM	7:00 AM	same day
3:00 PM	10:00 AM	same day
5:00 PM	12:00 PM	same day
6:00 PM	1:00 PM	same day
9:00 PM	4:00 PM	same day

Why people convert Vietnam to SAST time

Scheduling a call from Vietnam to SAST: a 10:00 AM start in Vietnam lands at 5:00 AM in SAST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Vietnam and SAST are inside the 9-to-5 working day between 2:00 PM and 5:00 PM ICT time (9:00 AM–12:00 PM SAST). That is roughly 3 hours of usable overlap.
Coordinating a Vietnam-based team with SAST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -5h gap is not.
Block 2:00 PM–5:00 PM ICT as the recurring meeting window if you work primarily from Vietnam and need SAST colleagues present.

About ICT (Indochina Time)

Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving time.

About SAST (South Africa Standard Time)

South Africa Standard Time (SAST) is used in South Africa, Lesotho, and Eswatini. SAST does not observe daylight saving time. Johannesburg and Cape Town are major economic hubs in Africa.

Best time to call between Vietnam and SAST

Both Vietnam and SAST sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM ICT, which is 9:00 AM–12:00 PM SAST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Vietnam and SAST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

Vietnam is 5 hours behind SAST (ICT UTC+07:00 → SAST UTC+02:00). The shared working window is 2:00 PM–5:00 PM ICT. Remember to re-check around daylight-saving transitions.

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 Vietnam and SAST?

Vietnam (ICT, UTC+07:00) is 5 hours behind SAST (SAST, UTC+02:00). The gap is currently -5h.

How do I convert Vietnam time to SAST time?

Add -5h to Vietnam local time. For example, 9:00 AM in Vietnam is 4:00 AM in SAST.

What time is it in SAST right now?

SAST uses SAST at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -5h offset from Vietnam.