Date
The date referred to here is the date on which the layout was printed. (Dates of your
data sources are addressed in the Data Citations section). It is important to include
the date on most layouts that are intended to be stand‑alone prints. Layouts destined
for reports do not necessarily need a date because the report ought to already contain
date information, although it is still recommended to include one should there be
any chance that the map will be copied separately from the report. Layouts destined
for slide shows also do not need a date for the same reason, although one could be
included if the slide show will be posted in a digital realm or if your map slide will
be separated from the title slide (or wherever the date is).