World Timezones

CST-CHINA to IRST Converter

Compare IRST to CST-CHINA instead
China Standard Time12:35 pmFri, Jun 5
China Standard TimeCST
Asia · UTC+8
12:35 pmFri, Jun 5
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Iran Standard TimeIRST
Middle East · UTC+3:30
8:05 amFri, Jun 5
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p

Offset

The time difference between China Standard Time and Iran Standard Time is 4.5 hours.

4.5 hours

China Standard Time (CST) is ahead of Iran Standard Time (IRST).

CST: UTC+8

IRST: UTC+3:30

Neither China Standard Time nor Iran Standard Time is currently observing daylight saving time.

When to schedule

Business-hours overlap: 2 PM–5 PM in China Standard Time (9 AM–12 PM in Iran Standard Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 3:00 PM China Standard Time (10:30 AM Iran Standard Time).

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

China

  • New Year's DayThu, Jan 1
  • Chinese New Year (Spring Festival)Tue, Feb 17
  • Labour DayFri, May 1
  • Dragon Boat FestivalFri, Jun 19
  • Mid-Autumn FestivalFri, Sep 25
  • National DayThu, Oct 1

About these zones

China Standard Time is also known as CST. To call China, dial +86.

Iran Standard Time is also known as IRST. To call Iran, dial +98.

Iran Standard Time is approximately 3,950 miles northwest of China Standard Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

CST-CHINAIRSTDay
12:00 am7:30 pm-1 day
1:00 am8:30 pm-1 day
2:00 am9:30 pm-1 day
3:00 am10:30 pm-1 day
4:00 am11:30 pm-1 day
5:00 am12:30 amSame day
6:00 am1:30 amSame day
7:00 am2:30 amSame day
8:00 am3:30 amSame day
9:00 am4:30 amSame day
10:00 am5:30 amSame day
11:00 am6:30 amSame day
12:00 pm7:30 amSame day
1:00 pm8:30 amSame day
2:00 pm9:30 amSame day
3:00 pm10:30 amSame day
4:00 pm11:30 amSame day
5:00 pm12:30 pmSame day
6:00 pm1:30 pmSame day
7:00 pm2:30 pmSame day
8:00 pm3:30 pmSame day
9:00 pm4:30 pmSame day
10:00 pm5:30 pmSame day
11:00 pm6:30 pmSame day

Daylight saving time

Neither China Standard Time nor Iran Standard Time observes daylight saving time. The offset between these zones remains constant year-round.

See the daylight saving time page for transition dates across every time zone.

Daylight today

China Standard Time
Sunrise
4:51 AM
Sunset
6:56 PM
Day length
14h 5m
Iran Standard Time
Sunrise
4:50 AM
Sunset
7:18 PM
Day length
14h 28m

Daylight overlap: 9h 36m — 9:20 AM–6:56 PM in China Standard Time (4:50 AM–2:26 PM in Iran Standard Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Iran Standard Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in China Standard Time

  • PVG
  • SHA
  • PEK
  • PKX
  • SZX
  • CAN
  • FUO
  • CTU
  • TFU
  • TSN

Airports in Iran Standard Time

  • IKA
  • THR
  • MHD
  • IFN
  • PYK
  • TBZ

Related conversions

Common conversions

What is 9:00 am CST-CHINA in IRST?
9:00 am CST-CHINA is 4:30 am IRST.
What is 12:00 pm CST-CHINA in IRST?
12:00 pm CST-CHINA is 7:30 am IRST.
What is 12:30 pm CST-CHINA in IRST?
12:30 pm CST-CHINA is 8:00 am IRST.
What is 2:00 pm CST-CHINA in IRST?
2:00 pm CST-CHINA is 9:30 am IRST.
What is 5:00 pm CST-CHINA in IRST?
5:00 pm CST-CHINA is 12:30 pm IRST.
What is 11:30 pm CST-CHINA in IRST?
11:30 pm CST-CHINA is 7:00 pm IRST.