Hi
Thanks for idea.
I will try it , but I afraid, that there is problem after.
For example first step: article created 1st time -> A checked, DateA saved with value, DateB by default is saved 0,
next step: later, article changed, also these fields. A unchecked, DateA is with previous value, DateB is with new value saved. But problem is that DateA should be 0 and until I will not clean it up manually, it will stay the old.
The best way is to clear value on field switching on off, so values clearing to 0, or at least with save.
And thing is to make backend usable for "smart users", so I need to avoid: "please remember to clean up this field before switching".
Brgds