Blanking Cells Within Block Of Cells If Date Parameter Has Not Been Met?

Sample Chart.xlsx

I need to enter data every month for the following month (i.e. month end close, for previous month). For this example, let's say I just entered (in May) data for April. Current year is 2014. The attached above is what I have currently, and what I want to achieve. All of the cells have formulas, but I basically don't want data and variances shown for time periods not yet uploaded, so in my example, I should only see filled-in cells for January-April, and not May-December (keep in mind that 2013 data should remain, as these are time periods in the past). I've thought about many scenarios including: modifying the formula but not changing what it is currently doing (essentially gathering and adding data from a different worksheet), conditional formatting to "white out" all cells for months where 2014 data is not available using NOW or similar function. how to do it most efficiently without disrupting what's currently in place. T