In the process of studying the historical units of time, the etymological analysis of some words, the changes in the meaning of the words, the expansion of the meaning and the narrowing of the meaning during the analysis, most of the time-related units in the language of the analyzed works are the same in terms of form and meaning with the words that express the meaning of time in the modern Uzbek language. we witnessed the sameness, phonetic and morphological differences in some of them, and the fact that some units do not occur at all.