Telling Time in Thai: The 6-Hour Clock, Finally Explained

Ask a room full of learners which everyday topic trips them up most, and telling time in Thai comes up again and again. It isn't the vocabulary that's hard — it's the system. Thai doesn't run on a single clock the way English does. In ordinary speech it carves the day into four chunks, gives each chunk its own word for “o'clock,” and restarts the count inside most of them. That's the famous Thai 6-hour clock, and once it clicks, it's genuinely simple.

This guide gives you the part every other page buries: a clean 24-hour-to-spoken-Thai conversion chart, an hour-by-hour walk through all four periods, and the shortcuts Thais actually use instead of the textbook forms. If you're brand new, skim our guide for beginners first — everything below assumes you can count to twelve in Thai.

Why telling time in Thai confuses everyone: four periods, six hours each

English uses one word, “o'clock,” for all twelve hours and bolts on AM or PM. The Thai time system splits the day and night into four spoken periods of roughly six hours each, and every period carries its own “o'clock” word:

Two things make this feel harder than it is. First, the number you say usually isn't the clock number in your head — 8 PM isn't “eight” anything, it's สองทุ่ม (sɔ̌ɔng thûm), literally “two thum.” Second, the evening and after-midnight counts restart from one, so you have to know which period you're in before the number means anything. Get the four period words above solid and you're most of the way there.

The traditional 6-hour clock system at a glance

Here is the traditional Thai 6-hour clock system in one place — the six blocks that carve up a full day, each with its own “o’clock” word and rough time range, before the hour-by-hour walkthrough below:

1. เช้า (cháo) — morning, 6 AM–11 AM — say the literal hour + โมง + เช้า.

2. เที่ยง (thîang) — noon, the one hour with no number or period word at all.

3. บ่าย (bàai) — afternoon, 1 PM–3 PM — say บ่าย + number + โมง (drop “one” for 1 PM).

4. เย็น (yen) — evening, 4 PM–6 PM — say number + โมง + เย็น.

5. ทุ่ม (thûm) — night, 7 PM–11 PM — say number + ทุ่ม; the count restarts at one.

6. ตี (dtii) — small hours, 1 AM–5 AM — say ตี + number; the count restarts at one again.

Midnight, เที่ยงคืน (thîang-khʉʉn), is the sixth fixed point that closes the loop back to เช้า. Each period word also carries its own tone — see our Thai tone chart — and once this list is solid, every one of the 24 hours below is a simple lookup.

The full conversion chart: 24-hour to Thai spoken time

Here is every hour of the day in the everyday spoken system — the forms you'll actually hear on the street in Bangkok. This is the chart to bookmark.

• 12:00 AM (midnight) — เที่ยงคืน thîang-khʉʉn

• 1:00 AM — ตีหนึ่ง dtii nʉ̀ng

• 2:00 AM — ตีสอง dtii sɔ̌ɔng

• 3:00 AM — ตีสาม dtii sǎam

• 4:00 AM — ตีสี่ dtii sìi

• 5:00 AM — ตีห้า dtii hâa

• 6:00 AM — หกโมงเช้า hòk moong cháo

• 7:00 AM — เจ็ดโมงเช้า jèt moong cháo

• 8:00 AM — แปดโมงเช้า bpɛ̀ɛt moong cháo

• 9:00 AM — เก้าโมงเช้า gâo moong cháo

• 10:00 AM — สิบโมงเช้า sìp moong cháo

• 11:00 AM — สิบเอ็ดโมงเช้า sìp-èt moong cháo

• 12:00 PM (noon) — เที่ยง thîang

• 1:00 PM — บ่ายโมง bàai moong

• 2:00 PM — บ่ายสองโมง bàai sɔ̌ɔng moong

• 3:00 PM — บ่ายสามโมง bàai sǎam moong

• 4:00 PM — สี่โมงเย็น sìi moong yen

• 5:00 PM — ห้าโมงเย็น hâa moong yen

• 6:00 PM — หกโมงเย็น hòk moong yen

• 7:00 PM — หนึ่งทุ่ม nʉ̀ng thûm

• 8:00 PM — สองทุ่ม sɔ̌ɔng thûm

• 9:00 PM — สามทุ่ม sǎam thûm

• 10:00 PM — สี่ทุ่ม sìi thûm

• 11:00 PM — ห้าทุ่ม hâa thûm

The four periods explained

Now the same information with the logic behind each block, so you can build the times yourself instead of memorizing twenty-four phrases. This is how Thais tell time in everyday conversation — the official 24-hour clock comes later.

Morning: chao (6 AM to noon)

Morning is the easy one for English speakers, because modern spoken Thai mostly uses the literal hour. 6 AM is หกโมงเช้า (hòk moong cháo), 7 AM เจ็ดโมงเช้า (jèt moong cháo), on up to 11 AM, สิบเอ็ดโมงเช้า (sìp-èt moong cháo). โมง is the daytime “o'clock” and เช้า (cháo, “morning”) tags the period. Noon breaks the pattern: 12:00 is เที่ยง (thîang) or เที่ยงวัน (thîang wan), never “twelve moong.” One historical wrinkle you should know: the older six-hour system counted 7 AM as โมงเช้า (“one moong”) and 8 AM as สองโมงเช้า (“two moong”). You'll still meet older speakers and textbooks doing that, which is exactly why สองโมงเช้า is ambiguous — and why most people today just say the literal hour.

• 6 AM–11 AM: literal hour + โมง + เช้า (e.g. หกโมงเช้า, เจ็ดโมงเช้า).

• Noon is always เที่ยง or เที่ยงวัน — never “twelve moong.”

• The old six-hour system counted 7 AM as โมงเช้า (“one moong”); expect it from older speakers, but default to the literal hour.

Afternoon: bai (13:00–16:00) and evening: yen (16:00–18:00)

At 1 PM the daytime count switches to บ่าย (bàai, “afternoon”). 1 PM is simply บ่ายโมง (bàai moong) — you drop the “one” — then บ่ายสองโมง (bàai sɔ̌ɔng moong, 2 PM) and บ่ายสามโมง (bàai sǎam moong, 3 PM). Late afternoon cools into เย็น (yen, “evening”), and here the word goes after the hour: สี่โมงเย็น (sìi moong yen, 4 PM), ห้าโมงเย็น (hâa moong yen, 5 PM), หกโมงเย็น (hòk moong yen, 6 PM). 4 PM sits on the seam, so both บ่ายสี่โมง and สี่โมงเย็น are fine.

• 1 PM–3 PM: บ่าย + number + โมง — drop “one” for 1 PM: บ่ายโมง.

• 4 PM–6 PM: number + โมง + เย็น — the word order flips after the period word.

• 4 PM sits on the seam, so both บ่ายสี่โมง and สี่โมงเย็น are used.

Night: thum (19:00–23:00) and the ti hours after midnight

At 7 PM the day-part word becomes ทุ่ม (thûm), and this is the count that surprises everyone: it restarts at one. 7 PM is หนึ่งทุ่ม (nʉ̀ng thûm) — often shortened to ทุ่มนึง (thûm nʉng) — then สองทุ่ม (sɔ̌ɔng thûm, 8 PM), สามทุ่ม (sǎam thûm, 9 PM), สี่ทุ่ม (sìi thûm, 10 PM), and ห้าทุ่ม (hâa thûm, 11 PM). Midnight is เที่ยงคืน (thîang-khʉʉn). After midnight the word changes again to ตี (dtii) and the count restarts once more: ตีหนึ่ง (dtii nʉ̀ng, 1 AM) through ตีห้า (dtii hâa, 5 AM). Watch the word order — ตี takes its number after it (ตีสอง), while ทุ่ม takes its number before it (สองทุ่ม). That small asymmetry is worth drilling until it's automatic.

• 7 PM–11 PM: number + ทุ่ม, and the count restarts at one — 7 PM is หนึ่งทุ่ม, unlike the literal-hour pattern used in the morning.

• Midnight is its own word, เที่ยงคืน, sitting between the two counts.

• 1 AM–5 AM: ตี + number, and the count restarts at one again — ตีหนึ่ง through ตีห้า.

• Watch the word order: ตี takes its number after it (ตีสอง), while ทุ่ม takes its number before it (สองทุ่ม).

Asking and answering “what time is it in Thai?” (gee mong laew)

The core question is กี่โมงแล้ว (gìi moong lɛ́ɛw), literally “how many o'clock already?” — that is, “what time is it in Thai?” — and you'll want it the moment you land. To be extra clear, lead with ตอนนี้ (dtɔɔn-níi, “now”).

To answer, just state the time, optionally with ตอนนี้ up front. Notice that the question always uses โมง as a generic “o'clock,” even when the true answer is a ทุ่ม or ตี hour — there is no “กี่ทุ่ม.” The same กี่โมง works for event times: รถออกกี่โมง (rót ɔ̀ɔk gìi moong) means “what time does the bus leave?”

Three patterns worth knowing by heart:

1. กี่โมงแล้ว (gìi moong lɛ́ɛw) — the default “what time is it?”

2. ตอนนี้กี่โมงแล้ว (dtɔɔn-níi gìi moong lɛ́ɛw) — the same question with “now” up front, for extra clarity.

3. Any subject + กี่โมง — e.g. รถออกกี่โมง (rót ɔ̀ɔk gìi moong), “what time does the bus leave?”

Answering is simpler still: state the time on its own — no verb needed — and always use โมง, ทุ่ม or ตี as the context demands, never the question word (which is always โมง).

Half hours and minutes — kreung and the numbers you need

For the half hour, add ครึ่ง (khrʉ̂ng, “half”) after the whole time: เจ็ดโมงครึ่ง (jèt moong khrʉ̂ng, 7:30 AM), บ่ายโมงครึ่ง (bàai moong khrʉ̂ng, 1:30 PM), สองทุ่มครึ่ง (sɔ̌ɔng thûm khrʉ̂ng, 8:30 PM). For any other minute, say the hour, then the minute number, then optionally นาที (naa-thii, “minute”): เก้าโมงสิบห้า or เก้าโมงสิบห้านาที (gâo moong sìp-hâa naa-thii) for 9:15. Thai counts minutes past the hour far more than minutes to it, so 6:50 is usually just “six-fifty,” หกโมงห้าสิบ. When you do want “to,” use อีก (ìik, “another”).

If your numbers are shaky, that's the real bottleneck here, not the clock. Our post on counting in Thai drills 1–10, and the guide to bigger Thai numbers takes you past a hundred, which you'll want for minutes and prices alike. If the tone marks in the romanization are throwing you, the Thai pronunciation guide explains the system these diacritics come from.

The shortcuts Thais actually use for telling time in Thai (and the official 24-hour clock on TV)

Textbooks hand you the full forms; real speech trims them. The common shortcuts: drop หนึ่ง and say ทุ่มนึง (thûm nʉng) for 7 PM; drop the period word entirely when context makes it obvious, so an afternoon “สองโมง” is understood as 2 PM; and use กว่า (gwàa, “past, gone”) for approximate times — บ่ายโมงกว่า (bàai moong gwàa) means “a little past 1.” Nobody outside a train platform sweats the exact minute.

The one place Thais do use a straight clock is anything official: TV and radio news, train and bus timetables, government forms, the military. There they use นาฬิกา (naa-lí-gaa) with the full 24-hour number — 13:00 is สิบสามนาฬิกา (sìp-sǎam naa-lí-gaa), and 18:30 is สิบแปดนาฬิกาสามสิบนาที (sìp-bpɛ̀ɛt naa-lí-gaa sǎam-sìp naa-thii). You'll hear it read aloud on the news, but almost no one talks to a friend this way. Learn to recognize it; don't feel obliged to speak it.

Time is a topic you can't fake — you either recognize สองทุ่ม the instant a friend texts it, or you don't. That kind of instant recall comes from hearing the forms in context and reviewing them on a schedule, which is exactly how Pasaa is built: every time phrase comes with native female audio and drops into a spaced-repetition (FSRS) queue, so ทุ่ม and ตี actually stick instead of blurring together. You can work through the whole time system on the free trial with no card required, and look up any single Thai word with audio whenever one trips you up.

Common mistakes when telling time in Thai

A handful of slip-ups explain most of the confusion — usually a tone problem rather than a vocabulary one. Brush up with our guide to Thai tones if any of these still trip you up:

• Treating โมง as universal — ทุ่ม and ตี each restart their own count from one, so 11 PM is ห้าทุ่ม, not an eleven-anything.

• Reversing the word order: ตี takes its number after it (ตีสอง, 2 AM), ทุ่ม takes its number before it (สองทุ่ม, 8 PM).

• Forgetting noon and midnight are exceptions — เที่ยง and เที่ยงคืน never take a number or โมง.

• Using the old six-hour form (สองโมงเช้า, “two moong”) for 8 AM — modern listeners default to the literal hour, so it lands as ambiguous rather than clearly 8 AM.

FAQ

Why does Thailand use a 6-hour clock?

Historically, time in Siam was marked by public sound: a gong struck through the day and a drum through the night, each counted in six-hour blocks. The spoken system preserves that heritage — four day-parts of roughly six hours, each with its own “o'clock” word (โมง moong for daytime, ทุ่ม thûm for evening, ตี dtii for the small hours). It predates and now coexists with the Western 24-hour clock, which Thailand adopted for official and written use but never for casual speech.

How do you ask what time it is in Thai?

Say กี่โมงแล้ว (gìi moong lɛ́ɛw), literally “how many o'clock already?” To be extra clear you can lead with ตอนนี้ (dtɔɔn-níi, “now”): ตอนนี้กี่โมงแล้ว. You always use โมง in the question, even if the answer turns out to be a ทุ่ม or ตี hour — there is no “กี่ทุ่ม.” The same กี่โมง also asks about schedules, as in รถออกกี่โมง, “what time does the bus leave?”

What does thum mean in Thai time?

ทุ่ม (thûm) is the “o'clock” word for the evening and night hours from 7 PM to 11 PM, and it's thought to imitate the sound of a drum once used to mark the night watches. The count restarts at 7 PM, so หนึ่งทุ่ม (nʉ̀ng thûm) is 7 PM, สองทุ่ม is 8 PM, and ห้าทุ่ม is 11 PM. Unlike ตี, which comes before its number, ทุ่ม comes after it.

How do you say 7 PM in Thai?

7 PM is หนึ่งทุ่ม (nʉ̀ng thûm), literally “one thum,” because the night count restarts at 7 PM. In casual speech many people shorten it to ทุ่มนึง (thûm nʉng). On official schedules and TV news you'll instead hear the 24-hour form, สิบเก้านาฬิกา (sìp-gâo naa-lí-gaa), “nineteen o'clock.”

Do Thai people also use the 24-hour clock?

Yes, but almost only in official contexts: TV and radio news, train and bus timetables, government paperwork, and the military. There they use นาฬิกา (naa-lí-gaa) with the full number, so 15:00 is สิบห้านาฬิกา (sìp-hâa naa-lí-gaa). In everyday conversation, though, Thais use the spoken 6-hour system, so it's worth learning both — speak the spoken system, and just recognize the 24-hour one when it's read out.

How do you say half past the hour in Thai?

Add ครึ่ง (khrʉ̂ng, “half”) after the whole time: เจ็ดโมงครึ่ง (jèt moong khrʉ̂ng) is 7:30 AM, บ่ายโมงครึ่ง (bàai moong khrʉ̂ng) is 1:30 PM, and สองทุ่มครึ่ง (sɔ̌ɔng thûm khrʉ̂ng) is 8:30 PM. For any other minute, state the hour, then the minute number, then optionally นาที (naa-thii, “minute”).