told as ...mong yen (, ), yen meaning evening. The system has been used in some form since the days of the Ayutthaya Kingdom, but was codified similarly to its present form only in 1901 by King Chulalongkorn in Royal Gazette 17:206. Nowadays, it is used only in colloquial speech. However, a corrupted form of the six-hour clock is more frequently encountered, 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. Clock format A comparison of the systems is as follows: * The word chao (เช้า) is optional here since the numbers 7 to 11 are not used elsewhere ** Conversationally, si mong yen (สี่โมงเย็น) and ha mong yen (ห้าโมงเย็น) are also spoken if considered as evening See also 12-hour clock 24-hour clock Date and time notation in Thailand The Italian six-hour clock, another six-hour system. Thai calendars, including the Thai solar calendar Thai numerals Time in Thailand References Thai culture Time measurement systems Date and time representation