OK - I’ve now fixed it - myself! Most of the answers here relate to Repeaters, or Text boxes - I’m using a TABLE, and this does not use the same parameters for dates as do Repeaters or Text boxes. The change I made was simple enough - I used the date type in the column (instead of string) for my table as such:
“id” : “col2” ,
“dataPath” : “date” ,
“label” : “Date” ,
“width” : 100 , // Column width
“visible” : true ,
“type” : “date” ,
“linkPath” : “link-field-or-property” ,