date_range Release date up to: ../../....
- The "Heat map" shows the total of appointments released per hour for last 7 days .
- The "Release date up to" shows the farthest date has been released at moment.
- User may take general view on those historical data and plan your appointment hunting.
- Due to numbers of reason the "Heat map" DOES NOT represent absolute accurate figure of each hour. User SHOULD NOT using the figure as a formal referencing materiel.