My question: how can i sign on on C3 inputing only 2100 and have the colon automatically inputted? I want to see 21:00 on C3 after input. Column C is Sign on time starting on row 3, the following formula calculates time on position even going past 24:00. [=IF(C4<C3,C4+24-C3,C4-C3)] I have D column automatically calculating time using the above formula which works perfectly IF I input the ":" but, I'm lazy and I want that colon inputted for me. Thank you. I'm going slightly beserk because I think I'm missing something too easy....