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SUBMIT YOUR IDEAplease find attached my solution which was similar to the one provided. I used the same formula against the 'output' provided to check as the 'Time_Now' were slightly different to the 'input' one.
Results slightly different but it sounds like thats normal:
I ended up doing it with a lot of tools, and ended coming back to the formula tool. Looking at a couple other methods - i didn't use the mod function, may have to come back and have a look at this.