Thirtieth means the thirtieth. Ordinal numbers are a type of numerals, mainly mentioned in English grammar, and expressed as "which number" in Chinese. In addition, in birthdays, ordinal words are also used when describing the date of birth. For example: May-first (May 1st).

Thirtieth means the thirtieth.

Ordinal numbers are a type of numerals, mainly mentioned in English grammar, and expressed as "which number" in Chinese. In addition, in birthdays, ordinal words are also used when describing the date of birth. For example: May-first (May 1st).