Target environment where bug is replicable: Windows 10 Enterprise 64-bit.
There is a bug in the DateTimePicker widget. If you select a time by clicking in the UI, it partially disregards your selection and forces the time to be set in AM time. As an example, select 3 PM in the UI and the result will be set to 3 AM. The only exception to this is with 12PM (or any derivative of that hour, such as 12:30PM). Presumably that is because the default time of a DateTimePicker is 12PM.
I do not know what version of Telerik we use at my company--someone else in my company has the license information and I cannot be bothered. Regardless, it does not matter. Just go to the Telerik website with any Windows 10 machine and replicate the issue. Link here: https://demos.telerik.com/aspnet-ajax/datetimepicker/overview/defaultcs.aspx
This bug cannot be replicated in all environments. For example, at my office, we have a server where the behavior is not replicated (Windows Server 2012 R2 64-bit).