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IRST to IDT Converter

Updating current time…
IRST
Iran Standard Time
GMT +3:30
12am
3am
6am
9am
12pm
3pm
6pm
9pm
IDT
Israel Daylight Time
GMT +3
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

3:30 pm15:30 IRST (UTC+3:30), Oct 12, 2026 = 3:00 pm15:00 IDT (UTC+3), Oct 12, 2026

IRST is 30 minutes ahead of IDT.

IRST and IDT examples

These examples always use IRST (UTC+3:30) and IDT (UTC+3). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

IRST is 30 minutes ahead of IDT.

How the time difference changes

For most of the year, IRST is 30 minutes ahead of IDT. At other times of the year, IRST is 1 hour and 30 minutes ahead of IST.

For most of the year, working hours of 9:00 am to 5:00 pm in IRST correspond to 8:30 am to 4:30 pm in IDT. At other times of the year, working hours of 9:00 am to 5:00 pm in IRST correspond to 7:30 am to 3:30 pm in IST.For most of the year, working hours of 09:00 to 17:00 in IRST correspond to 08:30 to 16:30 in IDT. At other times of the year, working hours of 09:00 to 17:00 in IRST correspond to 07:30 to 15:30 in IST.

Compare IRST time with IDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Iran Standard Time is 30 minutes ahead of Israel Daylight Time.
3:30 pm15:30 in IRST is 3:00 pm15:00 in IDT

IRST to IDT call time
Best time for a conference call or a meeting is between 9:30am-5pm09:30-17:00 in IRST which corresponds to 9am-4:30pm09:00-16:30 in IDT

3:30 pm15:30 Iran Standard Time (IRST). Offset UTC +3:30 hours
3:00 pm15:00 Israel Daylight Time (IDT). Offset UTC +3:00 hours

3:30 pm15:30 IRST / 3:00 pm15:00 IDT

IRSTIDT
12:00am11:30pm
1:00am12:30am
2:00am1:30am
3:00am2:30am
4:00am3:30am
5:00am4:30am
6:00am5:30am
7:00am6:30am
8:00am7:30am
9:00am8:30am
10:00am9:30am
11:00am10:30am
12:00pm11:30am
1:00pm12:30pm
2:00pm1:30pm
3:00pm2:30pm
4:00pm3:30pm
5:00pm4:30pm
6:00pm5:30pm
7:00pm6:30pm
8:00pm7:30pm
9:00pm8:30pm
10:00pm9:30pm
11:00pm10:30pm
00:0023:30
01:0000:30
02:0001:30
03:0002:30
04:0003:30
05:0004:30
06:0005:30
07:0006:30
08:0007:30
09:0008:30
10:0009:30
11:0010:30
12:0011:30
13:0012:30
14:0013:30
15:0014:30
16:0015:30
17:0016:30
18:0017:30
19:0018:30
20:0019:30
21:0020:30
22:0021:30
23:0022:30

Iran Standard Time

Offset: IRST is 3 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia

Countries using this time zone: Iran

Principal Cities: The largest city in the IRST time zone is Tehran in Iran, with about 7.153 million people. Other major cities in this time zone include Mashhad, Isfahan, Karaj, Tabriz.

Daylight Saving: Clocks in Iran Standard Time (IRST) do not change for daylight saving time, so IRST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

IRST Time Zone Geo Map
IRST timezone map

IRST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +0330 - basic
  • +03:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0330 - sign character (+) followed by a four digit time providing hours (03) and minutes (30) of the offset. Indicates an offset of three hours and thirty minutes to the east of the zero meridian.

Israel Daylight Time

Offset: IDT is 3 hours ahead Greenwich Mean Time (GMT) and is used in Asia

Countries using this time zone: Israel

Principal Cities: The largest city in the IDT time zone is Jerusalem in Israel, with about 971,800 people. Other major cities in this time zone include Tel Aviv, West Jerusalem, Haifa, Ashdod.

IDT Time Zone Geo Map
IDT timezone map

Daylight Saving: Israel Daylight Time (IDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Israel Standard Time (IST).

Daylight saving time clock moves forward for one hourStart: Israel Daylight Time (IDT) started on Friday, March 27, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Friday, March 27, 2026, 3:00 am03:00. Daylight saving starts annually on the last Friday of March.

Daylight saving time clock moves back for one hourEnd: Israel Daylight Time (IDT) ends on Sunday, October 25, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.

See upcoming clock changes worldwide.

IDT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +03 - basic short
  • +0300 - basic
  • +03:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0300 - sign character (+) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates an offset of three hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Charlie - Military abbreviation for IDT
  • C - short form of 'Charlie'
IANA/Olson: Reflects IDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Jerusalem
  • Asia/Tel_Aviv
  • Israel
Time zones with the GMT +3 offset:
  • EEST - Eastern European Summer Time
  • MSK - Moscow Standard Time
  • AST - Arabia Standard Time
  • C - Charlie Time Zone
  • EAT - Eastern Africa Time
  • FET - Further Eastern European Time
  • IDT - Israel Daylight Time
  • TRT - Turkey Time
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT