Convert nr of days to months and days

Any idea on how to do just months and days? i.e., if it's 1 year, 6 months and 5 days, it would equate to 18 months and 5 days. Any guesses?

Hi and welcome
Please do not hijack existing threads, but instead, start a new one, and, if necessary, add a link to the relevant thread(s). I did it for you this times.
Also, before posting, have a quick search on the Net as this is a well known problem.
https://answers.microsoft.com/en-us...and-days/5d2c7cdd-4ab5-4f5c-8a06-9e5d36fa5dcb