MeanwhileAST to IRST converter
Atlantic Time (Halifax) to Iran Time (Tehran).
IRST is 6 h 30 min ahead of AST.
9:00 AM AST = 3:30 PM IRST same day
Best time to meet
The best time to meet is between 9:00 AM and 11:00 AM AST, which is 3:30 PM to 5:30 PM IRST. Both sides are then inside 9 AM to 5 PM.
AST to IRST time table
For 30 Oct 2026. Green rows: both sides between 9 AM and 5 PM.
| AST | IRST |
|---|---|
| 12:00 AM AST | 6:30 AM IRST |
| 1:00 AM AST | 7:30 AM IRST |
| 2:00 AM AST | 8:30 AM IRST |
| 3:00 AM AST | 9:30 AM IRST |
| 4:00 AM AST | 10:30 AM IRST |
| 5:00 AM AST | 11:30 AM IRST |
| 6:00 AM AST | 12:30 PM IRST |
| 7:00 AM AST | 1:30 PM IRST |
| 8:00 AM AST | 2:30 PM IRST |
| 9:00 AM AST | 3:30 PM IRST |
| 10:00 AM AST | 4:30 PM IRST |
| 11:00 AM AST | 5:30 PM IRST |
| 12:00 PM AST | 6:30 PM IRST |
| 1:00 PM AST | 7:30 PM IRST |
| 2:00 PM AST | 8:30 PM IRST |
| 3:00 PM AST | 9:30 PM IRST |
| 4:00 PM AST | 10:30 PM IRST |
| 5:00 PM AST | 11:30 PM IRST |
| 6:00 PM AST | 12:30 AM IRST next day |
| 7:00 PM AST | 1:30 AM IRST next day |
| 8:00 PM AST | 2:30 AM IRST next day |
| 9:00 PM AST | 3:30 AM IRST next day |
| 10:00 PM AST | 4:30 AM IRST next day |
| 11:00 PM AST | 5:30 AM IRST next day |
Quick answers
- 9:00 AM AST = 3:30 PM IRST
- 12:00 PM AST = 6:30 PM IRST
- 3:00 PM AST = 9:30 PM IRST
- 5:00 PM AST = 11:30 PM IRST
- 9:00 AM IRST = 2:30 AM AST
- 12:00 PM IRST = 5:30 AM AST
- 5:00 PM IRST = 10:30 AM AST
Does the gap change during the year?
Yes, because of daylight saving. Until 1 Nov 2026: IRST is 6 h 30 min ahead of AST. From 1 Nov 2026 to 14 Mar 2027: IRST is 7 h 30 min ahead of AST. From 14 Mar 2027 to 7 Nov 2027: IRST is 6 h 30 min ahead of AST.
AST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−4), then on 14 Mar 2027 (forward 1 h, to UTC−3). IRST does not change its clocks.
About AST and IRST
AST here means Atlantic Time, the clock in Halifax. Right now it is UTC−3. Strictly, AST is the winter name; in summer these places use ADT. This page follows their real clock all year.
IRST here means Iran Time, the clock in Tehran. Right now it is UTC+3:30. It has no daylight saving.
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Coming soonMore conversions
AST to EST AST to CST AST to MST AST to PST AST to AKST AST to HST AST to NST AST to BRT AST to ART AST to COT AST to CLT AST to UTC AST to GMT AST to BST AST to CET AST to EET AST to MSK AST to TRT AST to SAST AST to WAT AST to EAT AST to GST AST to AFT AST to PKT AST to IST AST to NPT AST to BDT AST to ICT AST to WIB AST to SGT AST to HKT AST to PHT AST to KST AST to JST AST to AWST AST to ACST AST to AEST AST to NZST
Time in Halifax Time in Tehran Time in Mashhad Time in Isfahan Time in Karaj Time in Tabriz