kendo ui grid date sorting is not working -

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i trying sort data on desc date order can't, keep getting asc ordering on kendo ui grid, here code.

this.gridconfig = {         datasource: {             transport: {                 read: '/api/endpoint,                 datatype: 'json'             },             schema: {                 data: "my_data_var"             }         },         sort: { field: "date", dir: "desc"},         resizable: true,         filterable: true,         pageable: {             pagesize: 200         },         columns: [{             field: 'date',             title: 'date',             template: "#= kendo.tostring(kendo.parsedate(date, 'yyyy-mm-dd'), 'dd/mmm/yyyy') #"

sort option datasource configuration should :

   datasource: {         transport: {             read: '/api/endpoint,             datatype: 'json'         },         schema: {             data: "my_data_var"         },         sort: { field: "date", dir: "desc"}     },

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