What is the time difference between Shanghai and Tehran?
Tehran is 4.5 hours behind Shanghai right now (UTC+8 vs UTC+3:30).
How many hours ahead is Tehran?
Tehran is actually 4.5 hours behind Shanghai. When it is noon in Shanghai, it is 07:30 in Tehran.
When is the best time to call between Shanghai and Tehran?
Look for the overlap where both cities are in normal daytime. The strip on this page highlights 9am–5pm in each — the shaded columns that line up are your window. Large gaps mean early-morning or late-night calls for one side.
Does the difference change with daylight saving?
No. Neither city's offset relative to the other changes across the year, so the difference stays constant.
Why people use Captain Wake to wake up on time
Not because it rings louder. Because it removes every way your half-asleep brain talks you back into bed.
1
There is no button to tap
Swiping an alarm away is a reflex you can perform while still asleep. A mission needs your thinking brain switched on — and once it is on, sinking back under is much harder.
2
It survives every trick
Force-quit the app, restart the phone, flip it to silent, turn the volume down. The alarm re-arms and keeps going until the mission is actually done.
3
It gets you physically upright
Photo and barcode missions are anchored to a spot in another room, so the only way to stop the noise is to stand up and walk there. You cannot pre-stage it from bed.
4
It fixes the night, not just the morning
A sleep forecast before bed, bedtime reminders and wake-up streaks — because the 6 AM problem usually starts at 1 AM.
New time zone? Your body clock needs a firmer alarm.
Captain Wake keeps ringing until you complete a real-world mission — the fastest way to anchor a new wake-up time.
