Get current day values from database to plot on highcharts - mysql

Question

Hello i am designing a webserver which shows me a power consumption graph from a mysql database. I am a beginner and have written a code with some help that uses ajax calls to fetch the data from the database and plot it on the highcharts. Problem is that I get all the historic values saved in my database but I want only the values of current day to be plotted on the chart. This is my js code:
Highcharts.setOptions({
global: {
useUTC: false
}
});
$('#container').highcharts({
chart: {
type: 'area',
animation: Highcharts.svg, // don't animate in old IE
marginRight: 10,
},
title: {
text: ''
},
xAxis: {
type: 'datetime',
tickPixelInterval: 100
},
yAxis: {
title: {
text: 'POWER'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
tooltip: {
formatter: function () {
return '<b>' + this.series.name + '</b><br/>' +
Highcharts.dateFormat('%d-%m-%Y %H:%M:%S', this.x) + '<br/>' +
Highcharts.numberFormat(this.y);
}
},
legend: {
enabled: true
},
exporting: {
enabled: false
},
series: [{
name: 'Power Consumption',
data: (function () {
var data = [], i, t, d;
var request = {};
request['EndPoint'] = "arduino/charts/analog/fetch";
$.ajax({
type: "POST",
url: "../Server/fyp-processor.php",
data: JSON.stringify(request),
dataType: "json",
async: false,
success: function (result) {
if(result.Code == "1008" && (result.Data != null || result.Data != undefined)) {
for(i = 0; i < result.Data.Historic.length; i++) {
t = result.Data.Historic[i].DateTime.split(/[- :]/);
d = new Date(t[0], t[1]-1, t[2], t[3], t[4], t[5]);
data.push({
x: d,
y: parseInt(result.Data.Historic[i].Value)
});
}
}
}
});
return data;
}())
}]
});
It calls a fyp-processor php script that contains this code:
else if($postData['EndPoint'] == 'arduino/charts/analog/fetch') {
#result set
$resultSet = null;
#get all historic analog chart data
$results = $db->charts();
if(count($results) > 0) {
foreach($results as $result) {
$resultSet['Historic'][] = $result;
}
}
I would be glad if anyone could help me out to get only current DAY's data and also what changes I can do to it then to get current month and current week's data too.