Okay, I'm trying to subtract one field from another

field "due" is 20181112

and field "mynow" is 20181106

this works:
<<calc !!due -1>>
to give 20181111

but I've tried this
<<calc !!due -!!mynow>>
and this
<<calc !!due - !!mynow>>
and this
<<calc !!due -<$view field="mynow"/> >>

and I either get "20181112" as the result, or NaN 
<http://127.0.0.1:8080/#NaN>

Is the calc macro only able to calculate with a single field?


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