13th

13 (thirteen /θɜːrˈtiːn/) is the natural number following 12 and preceding 14.

In spoken English, the numbers 13 and 30 are often confused. When carefully pronounced, they differ in which syllable is stressed: 13 ⁱ/θɜːrˈtiːn/ vs. 30 /ˈθɜːrti/. However, in dates such as 1300 ("thirteen hundred") or when contrasting numbers in the teens, such as 13, 14, 15, the stress shifts to the first syllable: 13 /ˈθɜːrtiːn/. In a 24-hour clock, the thirteenth hour is in conventional language called one o'clock.