IRDT to D Converter
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Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
3:30 pm15:30 IRST (UTC+3:30), Oct 17, 2026 = 4:00 pm16:00 D (UTC+4), Oct 17, 2026
IRST is 30 minutes behind D.
IRDT and D examples
These examples always use IRDT (UTC+4:30) and D (UTC+4). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
IRDT is 30 minutes ahead of D.
How the time difference changes
IRST is 30 minutes behind D year-round.
Working hours of 9:00 am to 6:00 pm in IRST correspond to 9:30 am to 6:30 pm in D.Working hours of 09:00 to 18:00 in IRST correspond to 09:30 to 18:30 in D.
Compare IRDT time with D 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 behind Delta Time Zone.
3:30 pm15:30 in IRST is 4:00 pm16:00 in D
IRST to D call time
Best time for a conference call or a meeting is between 9am-5:30pm09:00-17:30 in IRST which corresponds to 9:30am-6pm09:30-18:00 in D
3:30 pm15:30 Iran Standard Time (IRST). Offset UTC +3:30 hours
4:00 pm16:00 Delta Time Zone (D). Offset UTC +4:00 hours
3:30 pm15:30 IRST / 4:00 pm16:00 D
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| IRST | D |
|---|---|
| 12:30am | |
| 1:30am | |
| 2:30am | |
| 3:30am | |
| 4:30am | |
| 5:30am | |
| 6:30am | |
| 7:30am | |
| 8:30am | |
| 9:30am | |
| 10:30am | |
| 11:30am | |
| 12:30pm | |
| 1:30pm | |
| 2:30pm | |
| 3:30pm | |
| 4:30pm | |
| 5:30pm | |
| 6:30pm | |
| 7:30pm | |
| 8:30pm | |
| 9:30pm | |
| 10:30pm | |
| 11:30pm | |
| 00:30 | |
| 01:30 | |
| 02:30 | |
| 03:30 | |
| 04:30 | |
| 05:30 | |
| 06:30 | |
| 07:30 | |
| 08:30 | |
| 09:30 | |
| 10:30 | |
| 11:30 | |
| 12:30 | |
| 13:30 | |
| 14:30 | |
| 15:30 | |
| 16:30 | |
| 17:30 | |
| 18:30 | |
| 19:30 | |
| 20:30 | |
| 21:30 | |
| 22:30 | |
| 23:30 |
Iran Daylight Time
Offset: IRDT is 4 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
IRDT representations, usage and related time zones
- +0430 - basic
- +04:30 - extended
- +0430 - sign character (+) followed by a four digit time providing hours (04) and minutes (30) of the offset. Indicates an offset of four hours and thirty minutes to the east of the zero meridian.
- AFT - Afghanistan Time
- IRDT - Iran Daylight Time
Delta Time Zone
Offset: D is 4 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Armenia, Azerbaijan, Georgia, Mauritius, Oman, Réunion, Russia, Seychelles, United Arab Emirates
Principal Cities: The largest city in the D time zone is Dubai in the United Arab Emirates, with about 3.79 million people. Other major cities in this time zone include Baku, Abu Dhabi, Sharjah, Samara.
Daylight Saving: Clocks in Delta Time Zone (D) do not change for daylight saving time, so D stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
D representations, usage and related time zones
- +04 - basic short
- +0400 - basic
- +04:00 - extended
- +0400 - sign character (+) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates an offset of four hours to the east of the zero meridian.
- Delta - Military abbreviation for D
- D - short form of 'Delta'
- KUYT - Kuybyshev Time
- MSD - Moscow Daylight Time
- SAMT - Samara Time
- AMT - Armenia Time
- AZT - Azerbaijan Time
- D - Delta Time Zone
- GET - Georgia Standard Time
- GST - Gulf Standard Time
- MUT - Mauritius Time
- RET - Reunion Time
- SCT - Seychelles Time