roll()

Rolls a date or datetime forward or backwards by a number of units.

The units accepted are: seconds, minutes, hours, days, months, years. Both singular and plural forms are accepted.

Data signatures
roll( date: $${\color{green}None}$$ ǁ $${\color{green}date}$$ ǁ $${\color{green}datetime}$$, how_many: $${\color{green}int}$$, unit: $${\color{green}str}$$ )

Call signatures
roll( date: Function ǁ Header ǁ Variable ǁ Reference, how_many: Function ǁ Header ǁ Variable ǁ Reference ǁ Term, unit: Term )

Purpose	Value
Main focus	roll() produces a calculated value

Context	Qualifier
Match qualifiers	onmatch
Value qualifiers	onmatch, notnone

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