1. Search XYZ Heatmap with Start menu, select 1st sample opj
2. in worksheet, uncheck set as categorical for column A
3. open column property dialog, set format to date, display to 2019, ok
4. select xyz column to plot heatmap, ok with default settings
5. double click x axis to open axis dialog
   ==> from to do not show date format control
6. go to tick label tab
   ==>tick label type is numeric, should be date type, since x column of heatmap is date.

Fixed in Origin2020.