How to allow users to select "no dates" (zero value)?

I am working on a project where I report time on different project like this: enter image description here

I check the dates, and I select the project I want to report the time onto. It's all good, but what if I do not have any time report for one day?

Right now I have it setup so I have a project called "No Time To Report" And I choose that project and put 8 hours onto that.

But if the issue with that is it will show up in my monthly summary. It will show up like I did work 8 hours on that project, while I did not work at all. Like this: enter image description here

I guess I could hard code it so that "No Time To Report" project doesn't show up in any list and it doesn't count the hours on that project. But would that be such a good thing to do?

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