I have been trying to solve this for several days now. I have a column of 'time served in position' that was calculated via a DatedIf formula and I need it in the yymm output. 5y3m, 1y2m and so on. I then need the average of all the time served in position below but it keeps giving me an error code. Can I not do an average of datedif values in yymm format? Snippet of column attached. Thank you for any insight on this.