Yokohama vs Sydney Time Difference

Yokohama runs 1 hour behind Sydney for half the year, and 2 hours behind for the other half. The gap shifts because Sydney moves its clocks for daylight saving and Yokohama never does. That makes the pair one of the easiest long-distance relationships to manage: a full working day overlaps in both directions, no matter the season.

Current time difference at a glance

Yokohama stays on Japan Standard Time (JST), UTC+9, every day of the year. No clock changes, no exceptions.

Sydney uses Australian Eastern Standard Time (AEST, UTC+10) during its autumn and winter, then jumps to Australian Eastern Daylight Time (AEDT, UTC+11) during spring and summer. The switch to AEDT lands on the first Sunday of October; the return to AEST lands on the first Sunday of April.

Yokohama is always behind Sydney. The only variable is whether the gap is one hour or two.

JST (UTC+9) vs AEST (UTC+10): the 1-hour gap

From early April to early October, Sydney stays on AEST. Yokohama is 1 hour behind.

• Yokohama 09:00 = Sydney 10:00
• Yokohama 12:00 = Sydney 13:00
• Yokohama 18:00 = Sydney 19:00

A single hour is barely a scheduling factor. Call from Yokohama at 10:00 and it is 11:00 in Sydney. Nobody loses their morning.

JST (UTC+9) vs AEDT (UTC+11): the 2-hour gap

From early October to early April, Sydney shifts to AEDT and the gap widens to 2 hours.

• Yokohama 09:00 = Sydney 11:00
• Yokohama 12:00 = Sydney 14:00
• Yokohama 18:00 = Sydney 20:00

Even at 2 hours, the window stays generous. A Sydney 09:00 start is 07:00 in Yokohama, which is early but usable. Sydney’s afternoon runs to 18:00 AEDT, which is 16:00 in Yokohama. Both sides stay inside standard business hours.

Why Yokohama and Sydney share the easiest call window

Book calls between 09:00 and 15:00 in either city and you will hit working hours on both ends. During the AEST period, Yokohama 09:00 to 12:00 gives you Sydney 10:00 to 13:00. During the AEDT period, the same Yokohama morning block gives you Sydney 11:00 to 14:00. No early alarms, no late-night compromises.

For a Yokohama team calling Sydney, dial at 10:00 JST. For a Sydney team calling Yokohama, dial at 11:00 AEST or 12:00 AEDT. Skip calls after 17:00 in either city unless you know the other side expects it.

When Sydney’s clock change shifts the Yokohama offset

Two Sundays a year, the offset moves. Yokohama’s clock never budges.

• First Sunday of October: Sydney advances from AEST to AEDT. The difference grows from 1 hour to 2 hours.
• First Sunday of April: Sydney falls back from AEDT to AEST. The difference shrinks from 2 hours to 1 hour.

In 2026, Sydney moves to AEDT on 4 October 2026 and returns to AEST on 4 April 2027. Put both dates in your calendar if you run recurring meetings.

Yokohama to Sydney time conversion table

Add 1 hour to Yokohama time for Sydney from April to October. Add 2 hours from October to April.