Best time to call
Cairo is 6 hours behind Tokyo. Here are the call windows that respect both your day in Tokyo (Japan) and theirs in Cairo (Egypt), plus the daylight saving and holiday traps to watch.
3 PM Tokyo
= 9 AM Cairo
3 PM in Tokyo = 9 AM in Cairo, fresh in their morning before the day fills up.
4 PM Tokyo
= 10 AM Cairo
4 PM in Tokyo = 10 AM in Cairo, fresh in their morning before the day fills up.
5 PM Tokyo
= 11 AM Cairo
5 PM in Tokyo = 11 AM in Cairo, inside their hours but early or late for you, so it is your sacrifice to make.
Watch out for these
Both cities are loaded with Tokyo 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
Cairo is 6 hours behind Tokyo. From your desk in Tokyo, 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 3 PM your time, which lands at 9 AM in Cairo.
At 6 hours apart, the overlap is real but tight, typically the back half of your morning against the front half of their afternoon, or the reverse. Treat the recommended slots as the load-bearing windows: book recurring syncs inside them and keep the edge hours for one-off calls where someone has agreed to stretch.
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: Tokyo and Cairo 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.