Scenarios
Being out of sync has a cost, and it isn’t arithmetic.
There is always a person on the other end of a time zone. These are the situations where the gap stops being a number and starts being someone’s 6am.
Work that spans zones
The bucket where being out of sync costs money. Every one of these is a recurring problem rather than a one-off, which is exactly what makes it worth solving once.
DISTRIBUTED TEAMS, STANDUPS, AND THE ONE PERSON WHO ALWAYS DIALS IN AT DAWN
Somebody on this team is always taking the call at 6am
The standup was set when everyone was in two zones. There are five now, and the same person keeps eating the bad hour without anyone deciding that.
CLIENT WORK ACROSS CONTINENTS
My client keeps booking me during dinner
They are being perfectly polite. They are also picking 4pm their time, every time, and nobody has said out loud what that is where you live.
CONTRACTS, INVOICES, AND “END OF DAY”
They said EOD and I don’t know whose day
The deliverable is due EOD. There are eleven hours between your EOD and theirs, and one of you is going to be wrong about it.
HIRING AND ONBOARDING SOMEONE FAR AWAY
We hired someone eight zones away and nobody checked the overlap
Great candidate, signed the offer, started Monday. The shared working window turns out to be about ninety minutes.
ON-CALL ROTATIONS AND HANDOFFS
The handoff window nobody can agree on
Two engineers, one continent apart, and a rotation that needs a clean pass every day at an hour that is reasonable for both of them.
INTERVIEWS BOOKED ACROSS ZONES
I joined the interview an hour late and it was not my fault
The invite said 3pm. It did not say whose. You were on the call at 3pm exactly, and it had started an hour before.
Family, distance and the people you call
The emotional core of it. These are about care rather than arithmetic — and about the fact that the person on the other end will almost never tell you the timing was bad.
ADULT CHILDREN, AGEING PARENTS, AND A LONG-HAUL GAP
I keep calling my parents at the wrong hour
You are free at nine in the evening. Nine in the evening is four in the morning for them, and they will always pick up anyway, which is the problem.
LONG-DISTANCE RELATIONSHIPS
Our only shared hour is the one we’re both tired in
The overlap exists. It sits at the very end of one person's day and the very start of the other's, and finding it once is not the same as remembering it.
GRANDPARENTS, VIDEO CALLS, AND BEDTIME
I keep missing the grandkids before bed
There is a twenty-minute window between dinner and bath where they will sit still for a call. It moves when either country changes its clocks.
BIRTHDAYS, ANNIVERSARIES, AND THE DATE LINE
I wished her happy birthday a day late
It was the right date where you were standing. It had not been her birthday for eleven hours.
BEREAVEMENT, BAD NEWS, AND URGENT CALLS
Do I wake them, or do I wait?
There is news that cannot wait until morning and news that can, and you are trying to work out which this is while looking at a clock that says 2am somewhere else.
MIGRANT AND EXPAT FAMILIES
Sunday call, two countries, and the clocks changed in only one of them
The weekly call has worked for two years. Last Sunday one of you moved and the other didn't, and now it is an hour off until the other country catches up.
The clocks change
Twice a year, everything above breaks at once. Not everywhere on the same weekend, and not everywhere at all, which is what makes it so hard to see coming.
RECURRING MEETINGS THAT SURVIVE THE TRANSITION BADLY
Every March our weekly call moves and nobody knows why
Nothing was rescheduled. The invite is identical. It simply happens an hour earlier for half the attendees for three weeks.
TRANSATLANTIC SCHEDULES IN THE GAP WEEKS
For three weeks a year the US and Europe are out of step
The US springs forward in March. Europe waits. In between, every London–New York call is an hour off from what both calendars claim.
FLIGHTS BOOKED ACROSS A CLOCK CHANGE
My flight crosses the night the clocks change
The ticket says a departure time and an arrival time. One of them is in a different offset from the other, and the duration in between is not what subtraction suggests.
PHOENIX, HONOLULU, AND THE PLACES THAT DON'T CHANGE
Arizona doesn’t change its clocks and it wrecks my calendar twice a year
For half the year Phoenix matches one coast, for the other half it matches the other, and no recurring invite has ever handled it gracefully.
ALARMS, SHIFT WORK, AND THE 2AM HOUR THAT HAPPENS TWICE
The night with two 1:30ams
Clocks go back, the hour repeats, and anyone working a night shift or catching an early flight discovers what that means for a schedule.
Travel, arrival and the body
Where the abstraction stops being a number on a screen and becomes something your body has an opinion about.
RED-EYES AND EARLY LANDINGS
I land at 6am and I have no idea what that will feel like
You know the arrival time. What you actually need to know is what your own body will think that hour is.
CROSSING THE DATE LINE
I land before I took off
Departure Tuesday evening, arrival Tuesday afternoon. Nothing is wrong with the ticket.
LONG LAYOVERS IN A THIRD ZONE
Eleven hours in an airport in a zone I’m not staying in
Your body is on one clock, the terminal is on another, and the place you are going is on a third.
BUSINESS TRIPS WITH CALLS BACK HOME
I’m travelling and my team is still on the old schedule
You have moved nine hours. Your calendar has not, and every invite in it now means something different.
RETURNING HOME
Coming back is worse than going out
Same distance, same number of zones, and the recovery is not remotely symmetrical.
PLANNING AROUND DAYLIGHT AT THE DESTINATION
I arrive in December and I want to know how much light I get
Not the temperature, not the forecast. Sunrise, sunset, and how much of the day is usable when you get there.
Zones that behave strangely
Small, precise, and the cases cheap converters simply get wrong. Half hours, quarter hours, single-zone countries and a date line that does not run straight.
INDIA, AND ANY SCHEDULE THAT INVOLVES IT
The half hour that breaks every scheduling tool
India is +5:30, not +5 or +6. It also does not observe DST, so the gap to New York changes twice a year without India doing anything.
NEPAL, CHATHAM, AND THE QUARTER-HOUR ZONES
A time zone that is 45 minutes off
Nepal sits at +5:45. It is not a rounding error and it is not a bug in your calendar.
CHINA'S SINGLE ZONE
Sunrise at 10am and it’s the correct local time
One country, five geographic zones wide, one official clock. In the far west that means the sun comes up when the clock says mid-morning.
AUSTRALIA IN SUMMER
Three zones become five
Half the states change their clocks and half do not, and for a few months Australia has more distinct local times than it has time zones.
THE PACIFIC AND THE DATE LINE'S ZIGZAG
Two islands, an hour apart, a day apart
The line is not straight. Neighbouring places can sit on opposite sides of the calendar.
NEW YEAR ACROSS THE WORLD
Twenty-six hours of New Year
The first place celebrates and the last place celebrates more than a full day later, which is longer than a day, and that surprises people.
Looking for the conversion itself?
The guides cover the arithmetic — EST vs EDT, PST to EST, IST to EST, daylight saving, and the odd zones that break whole-hour maths.