revisionrenderer: renderContent(): Add modifydatetime var

revisionrenderer.cpp

@@ -42,6 +42,7 @@ std::string RevisionRenderer::renderContent(std::string content)
 {
 	dynamicVarsMap["pagetitle"] = parser.extractCommand("pagetitle", content);
 	dynamicVarsMap["createdon"] = utils::toISODate(time(NULL));
+	dynamicVarsMap["modifydatetime"] = utils::toISODateTime(time(NULL));
 
 	std::string resolvedContent = parser.parseDynamics(content, std::bind(&RevisionRenderer::dynamicCallback, this, std::placeholders::_1, std::placeholders::_2));
 
@@ -60,6 +61,7 @@ std::string RevisionRenderer::renderContent(const Revision &r, std::string_view
 
 	dynamicVarsMap["createdon"] = utils::toISODate(firstRevision.value().timestamp);
 	dynamicVarsMap["pagetitle"] = customTitle;
+	dynamicVarsMap["modifydatetime"] = utils::toISODateTime(r.timestamp);
 
 	std::string resolvedContent = parser.parseDynamics(r.content, std::bind(&RevisionRenderer::dynamicCallback, this, std::placeholders::_1, std::placeholders::_2));