These functions extract information about the dates and places of events.
Date finds the first DATE line one level deeper than the event node.
Long returns the verbatim values of the first DATE and PLAC lines in an event, catenated together and separated by a comma. Short abbreviates information from the first DATE and PLAC lines, catenates the shortened information together with a comma separator and returns it. Monthformat sets the month format style for later stddate calls. Dateformat sets the overall output format style for later stddate calls.