World Timezones

IRST to LHST Converter

Compare LHST to IRST instead
Iran Standard Time8:06 amFri, Jun 5
Iran Standard TimeIRST
Middle East · UTC+3:30
8:06 amFri, 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
Lord Howe TimeLHST
Oceania · UTC+10:30
3:06 pmFri, Jun 5
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a

Offset

The time difference between Iran Standard Time and Lord Howe Time is 7 hours.

7 hours

Iran Standard Time (IRST) is behind Lord Howe Time (LHST).

IRST: UTC+3:30

LHST: UTC+10:30

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

When to schedule

Business-hours overlap: 9 AM–10 AM in Iran Standard Time (4 PM–5 PM in Lord Howe Time).

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

Suggested time: 9:00 AM Iran Standard Time (4:00 PM Lord Howe Time).

This window may shift by an hour during daylight saving 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.

Australia

  • New Year's DayThu, Jan 1
  • Australia DayMon, Jan 26
  • Good FridayFri, Apr 3
  • Easter MondayMon, Apr 6
  • Christmas DayFri, Dec 25
  • St. Stephen's DayMon, Dec 28

About these zones

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

Lord Howe Time is also known as LHST, or LHDT. To call Australia, dial +61.

Lord Howe Time is approximately 8,350 miles east of Iran Standard Time.

Quick reference

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

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

Daylight saving time

Lord Howe Time observes daylight saving time; Iran Standard Time does not. The offset between the two zones changes when Lord Howe Time transitions: on Sunday, October 4, 2026, clocks spring forward from LHST to LHDT.

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

Daylight today

Iran Standard Time
Sunrise
4:50 AM
Sunset
7:18 PM
Day length
14h 28m
Lord Howe Time
Sunrise
6:47 AM
Sunset
4:59 PM
Day length
10h 11m

Daylight overlap: 5h 9m — 4:50 AM–9:59 AM in Iran Standard Time (11:50 AM–4:59 PM in Lord Howe 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 Iran Standard Time

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

Related conversions

Common conversions

What is 9:00 am IRST in LHST?
9:00 am IRST is 4:00 pm LHST.
What is 12:00 pm IRST in LHST?
12:00 pm IRST is 7:00 pm LHST.
What is 12:30 pm IRST in LHST?
12:30 pm IRST is 7:30 pm LHST.
What is 2:00 pm IRST in LHST?
2:00 pm IRST is 9:00 pm LHST.
What is 5:00 pm IRST in LHST?
5:00 pm IRST is 12:00 am LHST, the next day.
What is 11:30 pm IRST in LHST?
11:30 pm IRST is 6:30 am LHST, the next day.