Calendar Heatmaps- any way to define start month?

Hi all, 

I'm working on a dashboard that will show us the frequency that our Hosts are working (to help with training/knowing when people haven't worked for months etc). Not the usual use of Analytics, but the data is there, so why not?! 

I've made a heatmap widget for each Host (about 40 with a mix of fulltime/parttime/casual) and it works well, essentially looking at what dates they have each made orders. 

However, it's a little tricky to compare them all side by side, as they all start on different months, depending on the first month that they made orders (so are new staff might have February as their first month on the heatmap, but others might have June). Obviously, as it's looking at Order dates, it's producing an accurate heatmap; but I'm just wondering if anyone can think of a formula that might force the heatmap to start at June (even if no orders until Feb etc). (It's probably a no, but thought worth asking the geniuses on here! 

A snapshot of some below: 

Many thanks,
Alison

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