Thanks very much for that. Runs nicely on a local PC.
I see that you have modified the code slightly since the initial release and now is more clear of what and how we can modify the variables.
I initially changed the pattern according to mine, then since it does not change between summer and winter, with my very limited knowledge I had a hard time removing the IF function. Finally ended up in modifying the winter and summer months both to 0, and the trick was done!
Forgive my ignorance, but can this be "converted" to some other code with a basic UI, or is there a way to use it via a browser for example, so it can be used on a mobile phone or other device and without internet?