This is likely a repeat of https://tracker.moodle.org/browse/CONTRIB-4491 but our team had to do a workaround that I'd like to better understand, or even better have corrected, using version 4.0 for Moodle 3.9+ (2020121800) of the plugin.

Our system is on U.S. Eastern time and reports cannot be viewed on demand unless we add the following to line 101 of locallib.php:

date_default_timezone_set('America/New_York');