const now = new Date(); now.jsonDateKind = 'local'; const date = new Date(2024, 0, 1, 12, 34, 56, 789); date.jsonDateKind = 'local'; const cust = Date.newLocalKindDate(2012, 11, 21, 12, 21, 0, 0); var data = { s: "Hello World!", i: 1234, d1: new Date(), d2: now, d3: date, d4: cust }; Convert to Json