other / mew-iview

Broken initial scroll in time-picker with steps

Date utils improvements and specs

Date utility functions `prevMonth` and `nextMonth` change the source
date when using `src.set[Date|Month|FullYear]()`. This change creates a
copy of the date at entrance of function so we have a pure function.

Made some code refactor and added specs for these functions.

since now the index of the `[hours|minutes|seconds]List` might not
anymore match the correct number in value