We made some changes in the Parser in date/time pickers and that it is what causes the described behavior. It's logged as feature request in our Public Issue Tracking System (PITS) and you can affect its priority by voting for it. The more clients' requests we receive the sooner we'll include it in our development plans. You can track this progress in our PITS with Issue ID = 2766.
You could workaround it by implementing your own parser that suits your needs. You need to handle the ParseDateTimeValue event and to parse the input string to DateTime value. Attached you can find a sample that I made. It illustrates how to accomplish the task.
Please do not hesitate to contact us if you require any further information.
All the best,
the Telerik team
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