addDate<- adds a column of class date to tables of
the object of class
An object of class
Other parameters: format, character vector encoding the date format;
A formula, numeric vector or character vector. Order of the column fields from where dates can be composed.
This method adds a column of class date to tables of the
object of class
expressed as string or integers may be converted and
stored as date objects in a new column whose name begins
with "date_" and follows with the names of column fields
involved in the date extraction.
So far, the new column will not be saved if the write method is invoked.
The actual object.
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