Japanese Time of Day Words: Asa, Hiru, Yūgata and Yoru on One Dial

The core idea: clock words and daylight words

The dial has two layers. The inner circle is the clock, split by a blue line at midnight and noon into gozen (午前) and gogo (午後). Go is the horse, the old two-hour period centred on midday, so gozen is literally 'before the horse' and shōgo (正午), noon, is 'exactly the horse'. Nothing about the weather or your routine moves that line.

The pink ring is the day as lived. Akegata, asa, hiru, yūgata and ban follow light, meals and sleep, and the gaps between them are real: nobody agrees on the minute when morning ends. Around the outside run yoru, night, which crosses midnight, and shin'ya, late night, which has legal edges at 22:00 and 5:00. When a word puzzles you, ask whether the speaker means the clock or the sky. A flatmate asking about tomorrow will hear both layers.

UnihongoVocabulary

明日あしたは朝あさ早くはやく出かけでかけます。I'm heading out early tomorrow morning.

Morning: akegata, asa and gozen

Akegata (明け方) is literally 'the dawning side': the hour or so when the sky pales, roughly four to six, earlier in June than in December. Asa, morning, starts when people get up and fades by about ten. It carries daily life with it: asagohan is breakfast, and asa ichi, first thing in the morning, is when a colleague wants your reply.

Gozen covers the whole span from midnight to noon, so gozen sanji is 3 a.m., a time nobody would call asa. In speech people usually pick the daylight word and add a number: asa no shichiji, seven in the morning; yonaka no niji, two in the middle of the night. Gozen belongs to appointments, tickets and announcements, and gozenchū, any time before noon, is a favourite of delivery slots. Below, a delivery driver, a colleague and a neighbour each talk about the morning.

Midday and afternoon: hiru and the missing word

Hiru (昼) has three jobs. It is noon, as in hiru no jūniji. It is lunch, usually with o in front, as in ohiru. And it is daytime as opposed to night, as in hiruma. Hirumae and hirusugi, literally 'before midday' and 'past midday', cover late morning and early afternoon.

After that, everyday Japanese has no single word for mid-afternoon; people say gogo or name the hour. The nearest lived word is oyatsu, the afternoon snack, which comes from yatsu, 'eight', the old name for the hours around two to four in the afternoon. The snack kept the name after the clock changed. Colleagues plan lunch and the afternoon.

Evening and night: yūgata, ban and yoru

Yūgata (夕方), literally 'the evening side', runs from late afternoon until the light goes, so it is over by about half past four in December and lasts until seven in June. After dark come ban and yoru, the pair learners most often confuse.

Ban (晩) is the evening as part of the day's routine, the time of dinner and winding down: bangohan is dinner and konban is this evening. Yoru (夜) is night as darkness, the whole span from dusk to dawn, including hours you sleep through. So maiban, every evening, suits a habit like a walk after dinner, while hiru to yoru, day and night, is the natural pair of opposites. Yonaka (夜中) is the dead of night, and shin'ya (深夜), literally 'deep night', is the late-night stretch. Here are a parent, a flatmate and a tired colleague.

Beyond the basics: where the edges blur

Soft edges are the point, not a flaw. Yūgata is tied to the light, and in Tokyo the sun sets around 16:30 in early December and around 19:00 in late June, so the same clock time can be yūgata in summer and yoru in winter.

Where precision matters, institutions fix the edges. The Japan Meteorological Agency defines each forecast word by the clock, so rain forecast for the yūgata can start at 15:00. Labour law defines shin'ya as 22:00 to 5:00, the hours that earn a late-night premium, and most taxi meters add a surcharge in the same window. The table sets everyday use beside the forecasters' definitions.

Forecasters also say kon'ya, tonight, rather than konban, because ban can mean either the early evening or the whole night. You hear these on the forecast and at work.

Which greeting fits which part of the day

Greetings follow the daylight layer, not the clock. Ohayō gozaimasu covers the morning until about ten or eleven. Konnichiwa takes over through the middle of the day, and konbanwa begins when it gets dark, which is why the switch comes around half past four in winter and closer to seven in summer. Oyasuminasai is not for meeting anyone: it is a parting line for bedtime or for leaving late at night.

Two related customs need only a mention. Workplaces use ohayō gozaimasu at the start of a shift at any hour, a habit explained in the site's post on good morning. And konnichiwa is for people outside your circle; you do not say it to your family or to colleagues you see every day. Here is one neighbour met at four points in a winter day.

UnihongoVocabulary

おはようございます。今朝けさは冷えひえますね。Good morning. It's chilly this morning, isn't it?

24-hour time on timetables, shop hours and 25:00

Printed Japan runs on the 24-hour clock. Train timetables, shop doors and booking sites write 18:05 or 21:30, and speech usually converts to the lived day: a timetable's 21:30 becomes yoru no kuji han. Station announcements and shift rotas often read the numbers as they stand, jūhachiji gofun; the numbers themselves are in the site's post on telling the time.

Then there is the notation that surprises everyone. Television listings, late-night radio and some bars keep counting past 24 so that a night stays attached to the day it started. A show at 25:30 on a Saturday listing airs at 1:30 on Sunday morning, and a bar open 18:00 to 26:00 closes at 2:00. The same idea, written the other way, uses yoku (翌), the next day: 18:00 to yoku 2:00. This is called sanjū-jikan-sei, the 30-hour system, and its logic is the lived day again: the day ends when you go to sleep, not when the clock rolls over.

UnihongoVocabulary

このアニメ、土曜どようの二に十じゅう五ご時半じはんからだって。Apparently this anime is on Saturdays at 25:30.

Common mistakes with time-of-day words

Putting gozen or gogo in front of twelve. English 12 a.m. and 12 p.m. confuse everyone, and gozen jūniji and gogo jūniji are just as ambiguous. For noon say shōgo or hiru no jūniji; for midnight, yoru no jūniji or reiji.

Using yūgata for 20:00. English evening runs until bedtime, but yūgata ends with the light. After dark it is yoru or ban.

Greeting a neighbour with konnichiwa at 8:00. Textbooks translate it as hello, so learners use it all day. Until mid-morning, ohayō gozaimasu is the natural choice.

Saying konbanwa as you leave. English good evening and good night blur together, but konbanwa is only for meeting. When you part at night, say oyasuminasai, or osaki ni shitsurei shimasu at work.

Turning up on the wrong night. A broadcast or booking at 25:00 on a Friday is in the early hours of Saturday, so convert before you set an alarm. Confirming out loud sounds like this.