Hello,
1 - Like I wrote, it's not really "last 30 days", it's the past month.
2 - If you want to use the Reports, you need to activate the legacy dashboard in the HikaShop configuration.
Improvements for the new dashboard is in our TODO list but is not ready yet.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.