Calling Home Across Time Zones: A Guide for Military Families
When someone you love is stationed overseas, the hardest part of staying in touch often isn't the distance. It's the clock. A call that's easy at dinner for you lands in the middle of their night, and a quick message after their shift arrives while you're asleep. Here's a simple way to stop doing the math every time.
Start With a Standing Call Window
Pick one or two windows a week that work for both of you and keep them. A fixed window means nobody has to work out the time difference on a tired evening, and nobody wakes up to a missed call they couldn't have taken. Treat it as a default, not a rule: duty schedules change, and a window you both know makes it easy to say "same time, next day" when one gets missed.
Find the Hours That Actually Overlap
The useful question isn't "what time is it there?" It's "which of my hours are also reasonable hours for them?" Take Okinawa, which is 13 hours ahead of U.S. Eastern time in summer and 14 hours ahead in winter, since Japan doesn't change its clocks. If both of you are awake from 8 AM to 10 PM, the shared hours in summer are only two short stretches:
- 8 to 9 AM Eastern, which is 9 to 10 PM in Okinawa
- 8 to 10 PM Eastern, which is 9 to 11 AM in Okinawa
That's three good hours a day. Knowing exactly where they are makes it much easier to protect them.
Watch for the Weeks the Gap Changes
The U.S. and Europe change their clocks on different weekends. This fall, Europe goes back an hour on October 25 and the U.S. on November 1, so for one week the gap between, say, Germany and the East Coast is five hours instead of six. A standing call can quietly land an hour early or late. We wrote up the details in Clocks Change Twice This Fall. Places that don't change their clocks at all, like Japan and Korea, shift relative to the U.S. twice a year instead.
A Tip From Aviation: Think in Zulu
The military and aviation both run on Zulu time, which is UTC. If your family member already plans their day in Zulu, agreeing on calls in Zulu removes the guesswork about whose time zone a number is in. Our Zulu time explainer covers how it works.
Let an App Do the Math
AvClock is built around airport codes, which turns out to be a handy way to save a place: add the airport nearest the base, like FRA for Frankfurt or OKA for Okinawa, next to your home airport. The free Overlap screen lays out a 24-hour strip for every saved place and shades the hours that work for everyone, inside a waking-hours or business-hours window. Tap any hour and you see every place's local time at that moment.
Service members, veterans, and military families can get AvClock Premium at half off with the code MILITARY. It adds logged flights with a jet lag plan and a departure countdown, handy for the trip home on leave. Here's how to redeem it.
AvClock is reference and informational only, not for actual flight planning or navigation. Always use official sources for that.