Excellent

Works very well, within limits.
Some masks might give surprising results so you need to check the output carefully with the full scope of possible entries. Adding impossible times is allowed and produces a figure different to the input as a result. Impossible dates are also allowed and give rise to the same figures as the input.
I’d have definitely considered purchasing the pro version if there was more information on entering custom masks. The possibility is mentioned but I found no information on the process involved or the scope of what is possible. Regex would be good…