漢数字
The days of the month are always written with two characters and numbered beginning with 1. Days one to 10 are written with the day's numeral, preceded by the character "Chū" (); "Chūyī" () is the first day of the month, and "Chūshí" () the 10th. Days 11 to 20 are written as regular Chinese numerals; "Shíwǔ" () is the 15th day of the month, and "Èrshí" () the 20th. Days 21 to 29 are written with the character "Niàn" () before the characters one through nine; "Niànsān" (), for example, is the 23rd day of the month. Day 30 (as applicable) is written as the numeral "Sānshí" ().