Assigning a value to one cell based on the date in another... And then doing it again
 

Hello,

I am working on a spreadsheet that is tracking additional vacation hours earned by employees as a result of perfect attendance.
For every 3 months of zero issues an employee earns an additional 4 hours of paid time off.

In column A I have listed the date of an employee's last incident
Column B is formulated to show the date in which the employee will be rewarded the additional hours (assuming there are no further incidents). Column B is also formulated to turn green when today's date matches the reward date.

Is it possible for column C to automatically add a value of 4 when Column B matches today's date? If so, is it possible for column B to repeatedly add 4 to its pre-existing value as column B reaches the next date of significance (I will be manually adjusting column A)?

If anyone is willing to share their knowledge/insight into this matter, it is greatly appreciated.

Thank you,
K