International calling guide
Iran uses IRST (UTC+3:30) in winter and IRDT (UTC+4:30) in summer — a rare half-hour offset that catches many callers off guard. The work week runs Saturday–Wednesday; Thursday is a half-day and Friday is the weekend. Best window: 9:30–11 AM on a Saturday or Sunday.
Iran
+98 · UTC
Local Time Now
--:--:-- AM
See the live time gap between a global reference city and Iran at a glance no calculator needed.
Reference
New Delhi Time Now
--:--:-- AM
Destination
Tehran, Iran Time Now
--:--:-- AM
A half-hour UTC offset, a Saturday–Wednesday work week, and annual Nowruz closures make Iran one of the trickiest countries to schedule calls with. Four factors that matter.
Pro tip: Call Iran between 9:30–11 AM IRST/IRDT on a Saturday or Sunday — the first working days of the week. This avoids the Monday effect and catches people fully settled in.
Iran uses IRST (UTC+3:30) in winter and IRDT (UTC+4:30) in summer — a rare 30-minute offset. Standard time converters often get this wrong. Always double-check.
Iran's official work week runs Saturday to Wednesday. Thursday is a half-day in many organisations. Friday is the weekend — never schedule business calls on Thursday afternoon or Friday.
Iran observes DST, shifting from IRST (UTC+3:30) to IRDT (UTC+4:30) from late March to late September. Update your schedule at the start of spring and autumn.
Nowruz begins around 20–21 March and is Iran's biggest holiday — businesses shut for up to two weeks. The Iranian fiscal year also resets then. Avoid this period entirely for business calls.
The time differences range from 8 hours ahead of UTC to 5 hours behind UTC, showcasing the diverse time zones across the globe.
UTC
0 hours
UTC
0 hours
UTC
0 hours
UTC
0 hours
The right window doubles your answer rate. The wrong one sends you straight to voicemail.
Avoid
Call on Thursday afternoon or Friday
Best Window
Sat–Sun, 9:30–11 AM IRST
Avoid
Ring during Nowruz (Mar 20–Apr 1)
Best Window
Mid-week in Iranian work week
Avoid
Call without knowing UTC+3:30 offset
Best Window
Scheduled, time-verified call
Avoid
Call during Ramadan fasting hours
Best Window
14:00–16:00 IRST post-lunch
Smart timing isn't just courtesy it directly drives better outcomes for every call you make.
Iran's Sat–Wed work week means Saturday morning calls outperform any Sunday outreach 2×.
2×
more pickups
Knowing IRST (UTC+3:30) and Iran's work week signals genuine preparation to Iranian contacts.
+38%
connect rate
Pre-confirmed mid-morning calls to Iran get 4× more engagement than cold or off-day attempts.
4×
engagement
Calling on Thursday afternoon or Friday — Iran's weekend — pushes 90% of calls to voicemail.
−90%
voicemail drops
Use these resources to plan every international call with confidence.
Iran's Saturday–Wednesday work week needs custom calendar rules — most schedulers default to Mon–Fri.
AI must account for IRST's rare UTC+3:30 offset to calculate accurate call windows.
IRST (UTC+3:30) is a half-hour zone — verify your converter supports it before scheduling.
Mark Thursday–Friday as the weekend for all Iran contacts; Saturday is the first work day.
Four simple steps for every international call to Iran dial it right, every time.
Press "+" on mobile or "00" from most landlines. This opens an international line.
Iran's international code. Every call to Iran must start with +98.
Iranian mobiles start with 09xx. Drop the leading 0 — dial 9xx plus the 8-digit number.
Dial the remaining digits. A typical Iranian mobile: +98 912 345 6789.
Jump to any country's best-time-to-call guide. Click any flag to open the full page.
All countries AZ
Pair perfect timing with carrier-grade routing. TKOS provisions inbound DIDs and outbound termination across 100+ countries on tier-1 interconnects.
Everything you need to know about timing, time zones, and dialing Iran (+98). Still have a question? Our wholesale team is one click away.
Saturday–Sunday, 09:30–11:00 AM IRST (UTC+3:30) is peak — Iran's work week runs Saturday–Wednesday. Thursday afternoon and Friday are the weekend. The +3:30 half-hour offset trips up most schedulers.