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You can set minimum value of chart using following code:
valueAxis: {
min: 0
}
More info on ChartJS documentation
I’m not sure I understand your second problem; I think you want to show you argument axis as contionus axis of time; now you have a list of possible string values, not datetime. You can specify it like this:
argumentAxis: {
argumentType: 'datetime'
}
It forces dxChart to convert string data to date time.
More info here
Source:stackexchange.com