A half diallel cross between 7 inbred lines of maize was evaluated at two different sowing dates for nine quantitative characters. Sowing date and crosses mean squares were significant for all traits under study. Significant crosses x sowing date mean squares were obtained for all studied traits except, No. of rows/ear. General and specific combing ability mean squares were significant for all traits. For days to tasseling and days to silking at early sowing date; ear height, No of rows/ ear at late sowing date; No of kernels/row and 100-kernel weight at early sowing date and combined analysis, high ratios GCA/SCA which largely exceeded the unity were obtained, indicating that a large part of the total genetic variability associated with these traits was a result of additive and additive by additive gene action. For No of rows/ ear at the combined analysis, the ratio equal to one this mean additive and non-additive gene action are similar in controlling this case. For remain cases, showed GCA/SCA ratios less than unity. Therefore, it could be concluded that the large portion of the total genetic variability for these traits was due to non-additive gene action. The parental inbred line No. 6 and 4 seemed to be good combiner for grain yield/plant. Also, the parental inbred line No. 3 exhibited significant desirable ( ) effects for silking date and grain yield/ plant. The crosses P₁xP₃, P₁xP₅, P₂xP₅, P₂xP₆, P₂xP₇, P₃xP_4, P₃xP_7, P₄xP₅, P₄xP₆, and P₅xP₆ had the highest values for SCA effects. The crosses 2x6 and 3x4 out yielded the check hybrid 168 by 7.1 and 7.9%, respectively in the combined analysis.