Custom Units Formatting For Nodes

I have an input value, by default the values are to 3 decimal places. The value is controlling time of day, and I have limited the input from 0-24, with the rest of the node setup meaning this number corresponds to the hour of day.

Is there a way that I can customise the input so that it always shows four numbers to the left of the decimal and 2 numbers to the right for this node only? That way the number will better correspond to time of day, e.g. 1250.75 for 12.30pm and 45 seconds. I would like the default to be 0000.00, and the max 2399.99.