Thank you for the additional information.
In order to fix the issue please change the template to:
"#= kendo.toString(kendo.parseDate(RequestedDate), 'dd MMM yyyy hh:mm') #"
On a side note, the RequestedDate should be already parsed as date. It seems that in your case it is not, please check if the field is set to type: "date" in the dataSource.schema.model.fields
Once it is set to type date the dataSource automatically parse and the template will be simplified to:
"#= kendo.toString(RequestedDate, 'dd MMM yyyy hh:mm') #"
I hope this information will help.
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