can you please help me evaluate what is wrong with the if statement below, i need to use it in a SharePoint 2013 calculated column, but I keep getting an error.
=if([Today]-[Last Reviewed Month/Year]<=180,"Green"
,if(and([Today]-[Last Reviewed Month/Year]>180,[Today]-[Last Reviewed Month/Year]<365),"Yellow"
, if([Today] -[Last Reviewed Month/Year])>365,"Red")))