World Timezones

LHST to IRST Converter

Compare IRST to LHST instead
Lord Howe Time3:06 pmFri, Jun 5
Lord Howe TimeLHST
Oceania · UTC+10:30
3:06 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
8:06 amFri, Jun 5
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p

Offset

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

7 hours

Lord Howe Time (LHST) is ahead of Iran Standard Time (IRST).

LHST: UTC+10:30

IRST: UTC+3:30

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

When to schedule

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

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

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

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

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

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

Quick reference

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

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

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

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

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

Related conversions

Common conversions

What is 9:00 am LHST in IRST?
9:00 am LHST is 2:00 am IRST.
What is 12:00 pm LHST in IRST?
12:00 pm LHST is 5:00 am IRST.
What is 12:30 pm LHST in IRST?
12:30 pm LHST is 5:30 am IRST.
What is 2:00 pm LHST in IRST?
2:00 pm LHST is 7:00 am IRST.
What is 5:00 pm LHST in IRST?
5:00 pm LHST is 10:00 am IRST.
What is 11:30 pm LHST in IRST?
11:30 pm LHST is 4:30 pm IRST.