Hi,
You cannot add a date value like this from within the normal configuration UI, but you can add a script editor web part to the page with this code:
<script type="text/javascript">
var spjs_chart_option_override = {
hAxis: {
minValue: new Date(2018, 1, 1),
maxValue: new Date(2019, 1, 12)
}
};
</script>
This will add these options to all the charts in the current page.
Hope this helps.
Alexander