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You can define text snippets with
#+MACRO: name replacement text $1, $2 are arguments
which can be referenced in
paragraphs, verse blocks, table cells and some keywords with
{{{name(arg1,arg2)}}}124. In addition to defined macros,
{{{title}}}, {{{author}}}, etc., will reference
information set by the #+TITLE:, #+AUTHOR:, and similar lines.
Also, {{{time(FORMAT)}}} and
{{{modification-time(FORMAT)}}} refer to current date time
and to the modification time of the file being exported, respectively.
FORMAT should be a format string understood by
format-time-string.
Macro expansion takes place during export.
Since commas separate arguments, commas within arguments have to be escaped with a backslash character. Conversely, backslash characters before a comma, and only them, need to be escaped with another backslash character.