Best time to call
Shanghai is 1 hour behind Seoul. Here are the call windows that respect both your day in Seoul (South Korea) and theirs in Shanghai (China), plus the daylight saving and holiday traps to watch.
11 AM Seoul
= 10 AM Shanghai
11 AM in Seoul = 10 AM in Shanghai, fresh in their morning before the day fills up.
12 PM Seoul
= 11 AM Shanghai
12 PM in Seoul = 11 AM in Shanghai, fresh in their morning before the day fills up.
1 PM Seoul
= 12 PM Shanghai
1 PM in Seoul = 12 PM in Shanghai, right around their lunch, so confirm they are at a desk.
Both cities are loaded with Seoul as the anchor. Adjust the day or hours to see the overlap shift, including around daylight saving transitions.
Sorted by participants in business hours
Green = inside 9:00–17:00
Shanghai is 1 hour behind Seoul. From your desk in Seoul, that means your afternoon is still their morning, and the window where both teams are at their desks is narrower than it looks. The cleanest single slot is 11 AM your time, which lands at 10 AM in Shanghai.
At 1 hour apart, you have a generous shared working day. Most of your morning lines up with most of theirs, so the choice is less about finding any overlap and more about hitting the callee's best energy. Aim for their mid-morning rather than their lunch or their wind-down.
The recommended slots above are computed against today's offset, which is the safe default. The trap is the twice-a-year daylight saving changeover: Seoul and Shanghai do not necessarily move their clocks on the same weekend, so for a few weeks each spring and autumn the gap can shift by an hour and every recurring invite quietly misfires. If your call is near a transition date, confirm the exact wall-clock time on both ends rather than trusting the difference.
On these dates both South Korea and China are likely off, so do not schedule.