What time is it in Ōta, Tokyo, Japan

What time is it in Ōta

Ōta is a special ward of Tokyo, the southernmost of the twenty-three, on the Kantō Plain in Japan, with Tokyo International Airport (Haneda) inside its bounds. It does not keep a Haneda hour, a ward hour, or a “Greater Tokyo” stamp of its own. Official clocks follow Japan Standard Time, nine hours ahead of Coordinated Universal Time, the same numerals as Shinjuku, Yokohama, and Naha at every instant. If a phone in Kamata and a phone in Shibuya disagree, one of them is set wrong.

This page is the Tokyo ward. Another Ōta sits in Gunma Prefecture, north of the capital. That namesake is a different point on the map. It is not a different Japanese civil hour. If a search result mixed the names, check the prefecture first. Then set the device to Japan Standard Time. Computers usually store that offset as Asia/Tokyo. The identifier is Japan’s zone file, not an Ōta ordinance.

A form that offers Tokyo, Osaka, or “Japan” is offering the same UTC+9. Do not arm a summer-time option. Present Japanese civil time does not spring forward. Take the updating numerals as the hour in force. A departure board photographed last week is a picture.

A Tokyo ward, not a Gunma namesake

Crossing from Ōta into Shinagawa, into Kawasaki, or onto the Haneda apron does not buy a new offset. Trains, school bells, and airport notices all print Japan Standard Time. A faster ride toward Tokyo Station is a change of platform, not a change of zone. If a device offers a second Japanese hour after a tower hand-off inside the capital, that is a device mistake. Set it back to Asia/Tokyo.

Japan Standard Time is built on the 135°E meridian. Ōta sits east of that line with the rest of Tokyo, so solar noon arrives before 12:00 on the wall. That lead is ordinary eastern-Honshū timekeeping. It is not a private Haneda zone. Lunch at 12:00 is still the civil habit. The sun’s peak is an earlier sky fact. Do not slide an invite toward the disk.

Civil stamp: Japan Standard Time, UTC+9, every month. Computer name: Asia/Tokyo — Japan’s file, including this ward. Daylight saving: not in current use. Namesake: Ōta in Gunma is a different pin on the same hour.

Sun and weather: this ward’s coordinates, not a Shinjuku substitute and not a Gunma copy. Okinawa is south. Hokkaido is north. Both stay on Japan Standard Time. What changes is day length and weather. A midsummer evening in Hokkaido is not a different zone from Ōta; it is a different latitude. This page’s sun table is this ward’s, not Sapporo’s. If your trip starts at Haneda and ends on another island, keep the hour and refresh the sunrise.

Haneda’s board is Japan Standard Time. It is not a municipal Ōta hour, and it is not Gunma.

Haneda weather and Kantō light

Sunrise and sunset on this page are calculated for Ōta’s coordinates on the chosen date. They are not a Tokyo-wide average. Buildings, bay haze, and low cloud can hide the disk from a street that geometry still calls “after sunrise.” The listed rising is the geometric instant the upper limb meets a flat horizon. First gleam from a hangar line of sight can come later. Keep the table for that geometric minute. Keep the apron for a disk you can actually see.

Day length changes enough that a 18:00 exit from an office is daylight in one month and night in another. That is latitude plus a fixed offset. It is the same mechanism as in Seoul, on the same hour, with a different bay and a different forecast. Copying a Seoul sunset into this page is still a mistake. Compute here. A June pair used in December is the wrong season.

Kantō weather is its own column. A humid summer, a winter that is cool rather than Harbin-cold, a rainy season in early summer, and the chance of typhoons later in the warm months are weather, not timekeeping. A dark noon in a rain band is still noon JST. The weather line is this ward’s present temperature and sky. It is not a Narita substitute, not a Gunma highland reading, and not a reason to write “after the last departure” when the other party needed a civil timestamp.

For mixed readers, write “09:00 Ōta, Tokyo (JST, UTC+9)” rather than “Ōta time” alone. The Gunma namesake problem is real. Partners who still change clocks will see the gap twitch while this ward does nothing. Store the event as Asia/Tokyo so only their display moves. There is no Japanese spring-forward to wait for.