[MRTCAL\]INDEX [BUILD|UPDATE|WATCH [DirName]] [/FILE IndexFile]
[/RECURSIVE] /DATE DateString
The option /DATE allows to restrict the files to be indexed for a given
date only. Accepted formats are:
- DD-MMM-YYYY (MMM as letters),
- YYYYMMDD (all numbers),
- Keyword "TODAY" or "YESTERDAY".