The purpose of this study is was to develop an Iranian Adolescent Time Attitude Scale. For this reason, two studies have done among Iranian adolescents to develop and validate of a time attitudes scale. In the first study, a qualitative method as well as grounded theory was used to conceptualize time attitude. Participants in the first study included 45 adolescents (23 male and 22 female) aging 15 to 17 years old with the average age of 16. 20. Six focus groups were formed in schools for girls and schools for boys. The results of open and axial coding for past, present and future shows that this period of life contains eight categories of positive future, negative future, hedonist present, negative present, futurist present, positive past, negative past, and past acceptance. In the second study based on the codes obtained from interviews develop a scale to measure time attitude was drafted viewing time scale then examined its psychometric properties. Participants in the second study included 938 school students (493 female and 445 male) in the second and third grade of Iranian high school. The findings of exploratory factor analysis indicated that time attitude scale for adolescent Iranian contained 34 items measuring eight dimensions including positive future, negative future, negative present, hedonistic present, futuristic present, negative past, past acceptance and positive past. Fit indices in confirmatory factor analysis model, confirmed validity of this attitude scale. Based on the findings, time attitude scale can be as valid and reliable instrument for assessing attitudes toward adolescents Iranian used.