Hi Neill,
Thanks for contacting Syncfusion support.
We have looked into your query “Prevent the To date being before the From date”. We would like to let you know that we cannot choose the EndDate less than the StartDate in DateRangePicker component. This is the default behavior of our DateRangePicker control.
To know more about our DateRangePicker component, please refer the below UG Documentation link.
To know more about DateRangePicker’s API, methods, events please refer the below API Documentation link.
For your convenience we have prepared the sample with StartDate and EndDate values and attached in the below link. Please check it.
If we misunderstood your query or it doesn’t meet your requirement, please revert with more information that will help us to provide the exact solution.
Regards,
Berly B.C