It is correct that simply changing the value of the inputs programmatically will not apply the changes to the data time. You should additionally trigger the change event:
I hope this helps.
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.