Round up/down datetime field with BPM or Formula

We have a requirement that I am really struggling with so all help welcome. Using the BPM I am adding SLA targets using Business Hours to our Tasks. This has been nice and easy to achieve using Business Rules and Processes adding onto the Datetime Start field we are using.

We have a need whereby if a Task is received after a certain time then rather than be 4 business hours it will be 14:00 the following day. I can add the hours but utilising a suite of Business rules to work out how many Business Hours to add.

The bit that I cannot figure out is how to round up/down to the nearest hour.

Has anyone been able to achieve this or similar please?

Thanks

*No code changes please. I would like to achieve if at all possible without impacting the core code.

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