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If you choose to retrieve old messages only, then you specify a time range in the text box. Only messages logged within that time range will be retrieved by the viewer. You may select a pre-defined time range, or enter one yourself in the format of "begin - end". In addition to the standard mm/dd/yy hh:mm:ss format, you may also use several special phrases as shorthand. (e.g. 11/26/07 08:00 - 11/26/07 12:30, or current day - now, or current hour - current minute, or current day - current shift). If instead of using a pre-defined date or typing one manually, you select "Assist..." from the drop down box, you'll get a little wizard that will help you construct a time range by specifying an anchor time and a duration.
Known Issues
In Jira, Cmlog Viewer is a component in the SEAL Project.
Summary of known Jira Issues: https://jira.slac.stanford.edu/secure/IssueNavigator.jspa?reset=true&mode=hide&sorter/order=ASC&sorter/field=priority&pid=10447&component=10850