When Transcript is executed one of the command line arguments it requires is a date in yyyyMMdd format which is termed the data date. The activities performed by Transcript are associated with this date in several ways, most notably:
when importing using automatic source tagging which specific Dataset file to import from \collected
to determine the concept of 'today' when processing files containing data with timestamps spanning multiple days
to determine the output directory into which RDF files will be generated
to generate the filename of the RDF files generated
The data date is made available to a Transcript task through the automatic creation of the ${dataDate} variable