https://www.infopathdev.com:443/forums/41.aspxIf you're not sure where to ask your question, ask it here. If necessary, our moderators will make sure it gets classified in the correct board.enCommunityServer 2007 SP3 (Build: 31118.962)https://www.infopathdev.com:443/forums/thread/116795.aspxMon, 24 Jul 2017 14:33:58 GMT033a2e2d-04e2-4a9d-be01-a4634161eefd:116795Reddy0https://www.infopathdev.com:443/forums/thread/116795.aspxhttps://www.infopathdev.com:443/forums/commentrss.aspx?SectionID=41&PostID=116795Hi , I am trying to create a rule to validate the entered Startdatetime and Enddatetime are falling within the already booked datetimes in the same list . Can you please guide me the right way to do so ? Any suggestion is greatly appreciated . Let me know if you need any additional information. My question is related to this video-- Prevent overlapping date periods in SharePoint list(https://www.youtube.com/watch?v=1WSF-amgVBE) Can anyone tell me how did he write the rules for it?