Limiting the numbers in a textbox

I have this 4 textboxes text1 = time in text2 = time out text3 = total number of hours work text4 = total number of hours work in 1 month What I want to do is to limit the numbers in text1 and text2 from 1 to 12 only. Of course inputting a number in each textbox is infinite and I want to put a range of 1 to 12 only (including the minutes ranging from 1 to 60). Is it possible to limit it? I don't have a code yet because I'm thinking of another possible way to do this. I try to download some codes related to my problem and still no answer. Anyway, is this manually type or you can limit it? I have no more idea about this. And also how to limit its minutes like 12:45. We know that in 1 hour there is 60 minutes. I also want to limit the minutes range 1 to 60. Kindly please help me with this one. I don't have any idea about this. I have red many books and downloaded source codes related to this one but still no answer. Thank you for the reply in advance.