I'd like to set up an Excel spreadsheet so I can enter the date I want to fly and have columns for the different airlines so it would show the date for 360 days out (CX), 353 (QF), 330 (AA, JL) etc. I know how to do basic Excel sheets but don't know how to do this. I've done Google searches and can find how to write a formula to tell you the number of days between two dates but can't find one where I can enter a date and have it tell me the date say 353 days earlier. If anyone with a good knowledge of Excel knows how to write a formula that would do this it would be much appreciated and very helpful if you could share it.