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The six-hour clock is a traditional timekeeping system used in the Thai and formerly the Lao language and the Khmer language, alongside the official 24-hour clock. Like other common systems, it counts twenty-four hours in a day, but it divides the day into four quarters, counting six hours in each. The hours in each quarter (with the exception of the sixth hour in each quarter) are told with period-designating words or phrases, which are: [1]
These terms are thought to have originated from the sounds of traditional timekeeping devices. The gong was used to announce the hours in daytime, and the drum at night. Hence the terms mong, an onomatopoeia of the sound of the gong, and thum, that of the sound of the drum. Ti is a verb meaning to hit or strike, and is presumed to have originated from the act of striking the timekeeping device itself. [2] Chao and bai translate as morning and afternoon respectively, and help to differentiate the two daytime quarters.
The sixth hours of each quarter are told by a different set of terms. The sixth hour at dawn is called yam rung (ย่ำรุ่ง, [jâmrûŋ]), and the sixth hour at dusk is called yam kham (ย่ำค่ำ, [jâmkʰâm]), both references to the act of striking the gong or drum in succession to announce the turning of day (yam), where rung and kham, meaning dawn and dusk, denote the time of these occurrences. The midday and midnight hours are respectively known as thiang (เที่ยง, [tʰîaːŋ], or thiang wan, เที่ยงวัน, [tʰîaːŋwān]) and thiang khuen (เที่ยงคืน, [tʰîaːŋkʰɯ̄ːn]), both of which literally translate as midday and midnight. [1]
Midnight is also called song yam (สองยาม, [sɔ̌ːŋjāːm]; note that yam is a different word), a reference to the end of the second three-hour period of the night watch (song translates as the number two). In addition, hok (6) thum and ti hok may also be used to refer to the hours of midnight and dawn, following general usage for the other hours, although more rarely; and the fourth to sixth hours of the second daytime half may also be told as ...mong yen (...โมงเย็น, [mōːŋjēn]), yen meaning evening.
The system has been used in some form since the days of the Ayutthaya Kingdom,[ citation needed ] but was codified similarly to its present form only in 1901 by King Chulalongkorn in Royal Gazette 17:206. [3] Nowadays, it is used only in colloquial speech. However, a corrupted form of the six-hour clock is more frequently encountered, [2] where usually the first half of daytime (including the sixth hour of the preceding quarter) is counted as in the twelve-hour clock, i.e. hok (6) mong chao, chet (7) mong, etc., up to sip et (11) mong.
The six-hour clock system was abolished in Laos and Cambodia during the French protectorate, and the French 24-hour clock system (for example, 3h00) has been used since.
A comparison of the systems is as follows:
Meaning | 6-hour | Modified 6-hour | 24-hour | 12-hour | ||
---|---|---|---|---|---|---|
Thai | RTGS | Thai | RTGS | |||
1 early morning | ตีหนึ่ง | ti nueng | ตีหนึ่ง | ti nueng | 01:00 | 1:00 am |
2 early morning | ตีสอง | ti song | ตีสอง | ti song | 02:00 | 2:00 am |
3 early morning | ตีสาม | ti sam | ตีสาม | ti sam | 03:00 | 3:00 am |
4 early morning | ตีสี่ | ti si | ตีสี่ | ti si | 04:00 | 4:00 am |
5 early morning | ตีห้า | ti ha | ตีห้า | ti ha | 05:00 | 5:00 am |
6 in the morning | ตีหก, ย่ำรุ่ง | ti hok, yam rung | ตีหก, หกโมงเช้า | ti hok, hok mong chao | 06:00 | 6:00 am |
1 in the morning | โมงเช้า | mong chao | เจ็ดโมง (เช้า)* | chet mong (chao)* | 07:00 | 7:00 am |
2 in the morning | สองโมงเช้า | song mong chao | แปดโมง (เช้า)* | paet mong (chao)* | 08:00 | 8:00 am |
3 in the morning | สามโมงเช้า | sam mong chao | เก้าโมง (เช้า)* | kao mong (chao)* | 09:00 | 9:00 am |
4 in the morning | สี่โมงเช้า | si mong chao | สิบโมง (เช้า)* | sip mong (chao)* | 10:00 | 10:00 am |
5 in the morning | ห้าโมงเช้า | ha mong chao | สิบเอ็ดโมง (เช้า)* | sip et mong (chao)* | 11:00 | 11:00 am |
midday | เที่ยงวัน | thiang wan | เที่ยงวัน | thiang wan | 12:00 | 12:00 pm |
1 in the afternoon | บ่ายโมง | bai mong | บ่ายโมง | bai mong | 13:00 | 1:00 pm |
2 in the afternoon | บ่ายสองโมง | bai songmong | บ่ายสองโมง | bai song mong | 14:00 | 2:00 pm |
3 in the afternoon | บ่ายสามโมง | bai sammong | บ่ายสามโมง | bai sam mong | 15:00 | 3:00 pm |
4 in the afternoon | บ่ายสี่โมง | bai simong | บ่ายสี่โมง** | bai si mong** | 16:00 | 4:00 pm |
5 in the afternoon | บ่ายห้าโมง | bai hamong | บ่ายห้าโมง** | bai ha mong** | 17:00 | 5:00 pm |
6 in the evening | หกโมงเย็น, ย่ำค่ำ | hok mong yen, yam kham | หกโมงเย็น | hok mong yen | 18:00 | 6:00 pm |
1 at night | หนึ่งทุ่ม | nueng thum | หนึ่งทุ่ม | nueng thum | 19:00 | 7:00 pm |
2 at night | สองทุ่ม | song thum | สองทุ่ม | song thum | 20:00 | 8:00 pm |
3 at night | สามทุ่ม | sam thum | สามทุ่ม | sam thum | 21:00 | 9:00 pm |
4 at night | สี่ทุ่ม | si thum | สี่ทุ่ม | si thum | 22:00 | 10:00 pm |
5 at night | ห้าทุ่ม | ha thum | ห้าทุ่ม | ha thum | 23:00 | 11:00 pm |
midnight | หกทุ่ม, เที่ยงคืน, สองยาม | hok thum, thiang khuen, song yam | หกทุ่ม, เที่ยงคืน | hok thum, thiang khuen | 24:00, 00:00 | 12:00 am |
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