Not writing down the time and date will not help in getting it dismissed.That said, there are other avenues. Such as no reasonable suspicion and/or probable cause.  I say this because in a dui scenerio there is rarely any reason to question/search the passenger. Lastely, you can use mistakes to impeach officers on the stand. Such as, if he tates on direct that he relies on his police report and it is accurate, you can impeach him with his mistakes and omissions.Hope this helps.