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The date values must be entered as a javascript Date object. Just like the documentation says,
data: [{
x: new Date(),
y: 1
}, {
t: new Date(),
y: 10
}]
So in my question, the dates could be represented by:
data: [
{x:new date(15-04-2018),y:10},
{x:new date(16-04-2018),y:20},
{x:new date(17-04-2018),y:30}
]
Source:stackexchange.com