Hi I'm using the default date picker in Umbraco. I have two added to my document type. Is there anyway to validate the first date picker selected date is not after the second date picker? Thanks

Have you tried DateTime.Compare (if .Net 9)? Or GreaterThan (.Net 8)? Assuming you're writing C#, and depending on what version of Umbraco you're running (thus what version of .Net), there are lots of available methods for datetimes :3 https://learn.microsoft.com/en-us/dotnet/api/system.datetime.compare?view=net-9.0