how to insert a non-standard Field -ie. day before today

[Nicole L.]

Is there a formula/code in order to insert a Field that will automatically
input the Full Month Before the current Date's Month (the date you're working
on the doc)?

Any ideas?

For example, this is for a Monthly Report - I want to be able to put the
field in the Heading/title to be the Monthly Report for the Month PRIOR to
when I'm filling the report out.

 

[Tony Jollans]

I suspect it should be simpler - these manipulations are awkward - but ...

{ Quote { ={ ={ If { date \@ "MM" } = 1 12 { ={ date \@ "MM" } - 1 } } * 100
+ { date \@ "yyyy" } * 10000 + 1 } \# "0000/00/00" } \@ "MMMM yyyy" }