diff --git a/includes/admin/reports/class-wc-report-sales-by-date.php b/includes/admin/reports/class-wc-report-sales-by-date.php
index ed962614fd0..f0de521fd9e 100644
--- a/includes/admin/reports/class-wc-report-sales-by-date.php
+++ b/includes/admin/reports/class-wc-report-sales-by-date.php
@@ -1,16 +1,17 @@
 <?php
+/**
+ * WC_Report_Sales_By_Date
+ *
+ * @package     WooCommerce/Admin/Reports
+ * @version     2.1.0
+ */
 
 if ( ! defined( 'ABSPATH' ) ) {
-	exit; // Exit if accessed directly
+	exit; // Exit if accessed directly.
 }
 
 /**
  * WC_Report_Sales_By_Date
- *
- * @author      WooThemes
- * @category    Admin
- * @package     WooCommerce/Admin/Reports
- * @version     2.1.0
  */
 class WC_Report_Sales_By_Date extends WC_Admin_Report {
 
@@ -106,7 +107,7 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			)
 		);
 
-		// All items from orders - even those refunded
+		// All items from orders - even those refunded.
 		$this->report_data->order_items = (array) $this->get_order_report_data(
 			array(
 				'data'         => array(
@@ -412,11 +413,11 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 		$this->report_data->total_sales = wc_format_decimal( array_sum( wp_list_pluck( $this->report_data->orders, 'total_sales' ) ) - $this->report_data->total_refunds, 2 );
 		$this->report_data->net_sales   = wc_format_decimal( $this->report_data->total_sales - $this->report_data->total_shipping - max( 0, $this->report_data->total_tax ) - max( 0, $this->report_data->total_shipping_tax ), 2 );
 
-		// Calculate average based on net
+		// Calculate average based on net.
 		$this->report_data->average_sales       = wc_format_decimal( $this->report_data->net_sales / ( $this->chart_interval + 1 ), 2 );
 		$this->report_data->average_total_sales = wc_format_decimal( $this->report_data->total_sales / ( $this->chart_interval + 1 ), 2 );
 
-		// Total orders and discounts also includes those which have been refunded at some point
+		// Total orders and discounts also includes those which have been refunded at some point.
 		$this->report_data->total_coupons         = number_format( array_sum( wp_list_pluck( $this->report_data->coupons, 'discount_amount' ) ), 2, '.', '' );
 		$this->report_data->total_refunded_orders = absint( count( $this->report_data->full_refunds ) );
 
@@ -441,26 +442,26 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 
 		switch ( $this->chart_groupby ) {
 			case 'day':
-				/* translators: %s: average total sales */
 				$average_total_sales_title = sprintf(
+					/* translators: %s: average total sales */
 					__( '%s average gross daily sales', 'woocommerce' ),
 					'<strong>' . wc_price( $data->average_total_sales ) . '</strong>'
 				);
-				/* translators: %s: average sales */
 				$average_sales_title = sprintf(
+					/* translators: %s: average sales */
 					__( '%s average net daily sales', 'woocommerce' ),
 					'<strong>' . wc_price( $data->average_sales ) . '</strong>'
 				);
 				break;
 			case 'month':
 			default:
-				/* translators: %s: average total sales */
 				$average_total_sales_title = sprintf(
+					/* translators: %s: average total sales */
 					__( '%s average gross monthly sales', 'woocommerce' ),
 					'<strong>' . wc_price( $data->average_total_sales ) . '</strong>'
 				);
-				/* translators: %s: average sales */
 				$average_sales_title = sprintf(
+					/* translators: %s: average sales */
 					__( '%s average net monthly sales', 'woocommerce' ),
 					'<strong>' . wc_price( $data->average_sales ) . '</strong>'
 				);
@@ -468,8 +469,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 		}
 
 		$legend[] = array(
-			/* translators: %s: total sales */
 			'title'            => sprintf(
+				/* translators: %s: total sales */
 				__( '%s gross sales in this period', 'woocommerce' ),
 				'<strong>' . wc_price( $data->total_sales ) . '</strong>'
 			),
@@ -486,8 +487,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 		}
 
 		$legend[] = array(
-			/* translators: %s: net sales */
 			'title'            => sprintf(
+				/* translators: %s: net sales */
 				__( '%s net sales in this period', 'woocommerce' ),
 				'<strong>' . wc_price( $data->net_sales ) . '</strong>'
 			),
@@ -504,8 +505,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 		}
 
 		$legend[] = array(
-			/* translators: %s: total orders */
 			'title'            => sprintf(
+				/* translators: %s: total orders */
 				__( '%s orders placed', 'woocommerce' ),
 				'<strong>' . $data->total_orders . '</strong>'
 			),
@@ -514,8 +515,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 		);
 
 		$legend[] = array(
-			/* translators: %s: total items */
 			'title'            => sprintf(
+				/* translators: %s: total items */
 				__( '%s items purchased', 'woocommerce' ),
 				'<strong>' . $data->total_items . '</strong>'
 			),
@@ -523,8 +524,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			'highlight_series' => 0,
 		);
 		$legend[] = array(
-			/* translators: 1: total refunds 2: total refunded orders 3: refunded items */
 			'title'            => sprintf(
+				/* translators: 1: total refunds 2: total refunded orders 3: refunded items */
 				_n( '%1$s refunded %2$d order (%3$d item)', '%1$s refunded %2$d orders (%3$d items)', $this->report_data->total_refunded_orders, 'woocommerce' ),
 				'<strong>' . wc_price( $data->total_refunds ) . '</strong>',
 				$this->report_data->total_refunded_orders,
@@ -534,8 +535,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			'highlight_series' => 8,
 		);
 		$legend[] = array(
-			/* translators: %s: total shipping */
 			'title'            => sprintf(
+				/* translators: %s: total shipping */
 				__( '%s charged for shipping', 'woocommerce' ),
 				'<strong>' . wc_price( $data->total_shipping ) . '</strong>'
 			),
@@ -543,8 +544,8 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			'highlight_series' => 5,
 		);
 		$legend[] = array(
-			/* translators: %s: total coupons */
 			'title'            => sprintf(
+				/* translators: %s: total coupons */
 				__( '%s worth of coupons used', 'woocommerce' ),
 				'<strong>' . wc_price( $data->total_coupons ) . '</strong>'
 			),
@@ -578,9 +579,9 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			'refund_amount'    => '#e74c3c',
 		);
 
-		$current_range = ! empty( $_GET['range'] ) ? sanitize_text_field( $_GET['range'] ) : '7day';
+		$current_range = ! empty( $_GET['range'] ) ? sanitize_text_field( wp_unslash( $_GET['range'] ) ) : '7day'; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotValidated, WordPress.Security.NonceVerification.NoNonceVerification
 
-		if ( ! in_array( $current_range, array( 'custom', 'year', 'last_month', 'month', '7day' ) ) ) {
+		if ( ! in_array( $current_range, array( 'custom', 'year', 'last_month', 'month', '7day' ), true ) ) {
 			$current_range = '7day';
 		}
 
@@ -594,18 +595,18 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 	 * Output an export link.
 	 */
 	public function get_export_button() {
-		$current_range = ! empty( $_GET['range'] ) ? sanitize_text_field( $_GET['range'] ) : '7day';
+		$current_range = ! empty( $_GET['range'] ) ? sanitize_text_field( wp_unslash( $_GET['range'] ) ) : '7day'; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotValidated, WordPress.Security.NonceVerification.NoNonceVerification
 		?>
 		<a
 			href="#"
-			download="report-<?php echo esc_attr( $current_range ); ?>-<?php echo date_i18n( 'Y-m-d', current_time( 'timestamp' ) ); ?>.csv"
+			download="report-<?php echo esc_attr( $current_range ); ?>-<?php echo esc_attr( date_i18n( 'Y-m-d', current_time( 'timestamp' ) ) ); ?>.csv"
 			class="export_csv"
 			data-export="chart"
 			data-xaxes="<?php esc_attr_e( 'Date', 'woocommerce' ); ?>"
 			data-exclude_series="2"
-			data-groupby="<?php echo $this->chart_groupby; ?>"
+			data-groupby="<?php echo esc_attr( $this->chart_groupby ); ?>"
 		>
-			<?php _e( 'Export CSV', 'woocommerce' ); ?>
+			<?php esc_html_e( 'Export CSV', 'woocommerce' ); ?>
 		</a>
 		<?php
 	}
@@ -613,7 +614,7 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 	/**
 	 * Round our totals correctly.
 	 *
-	 * @param array|string $amount
+	 * @param array|string $amount Chart total.
 	 *
 	 * @return array|string
 	 */
@@ -631,7 +632,7 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 	public function get_main_chart() {
 		global $wp_locale;
 
-		// Prepare data for report
+		// Prepare data for report.
 		$data = array(
 			'order_counts'         => $this->prepare_chart_data( $this->report_data->order_counts, 'post_date', 'count', $this->chart_interval, $this->start_date, $this->chart_groupby ),
 			'order_item_counts'    => $this->prepare_chart_data( $this->report_data->order_items, 'post_date', 'order_item_count', $this->chart_interval, $this->start_date, $this->chart_groupby ),
@@ -650,7 +651,7 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			$data['gross_order_amounts'][ $order_amount_key ][1] -= $data['refund_amounts'][ $order_amount_key ][1];
 
 			$data['net_order_amounts'][ $order_amount_key ] = $order_amount_value;
-			// subtract the sum of the values from net order amounts
+			// Subtract the sum of the values from net order amounts.
 			$data['net_order_amounts'][ $order_amount_key ][1] -=
 				$data['refund_amounts'][ $order_amount_key ][1] +
 				$data['shipping_amounts'][ $order_amount_key ][1] +
@@ -658,11 +659,11 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 				$data['tax_amounts'][ $order_amount_key ][1];
 		}
 
-		// 3rd party filtering of report data
+		// 3rd party filtering of report data.
 		$data = apply_filters( 'woocommerce_admin_report_chart_data', $data );
 
-		// Encode in json format
-		$chart_data = json_encode(
+		// Encode in json format.
+		$chart_data = wp_json_encode(
 			array(
 				'order_counts'        => array_values( $data['order_counts'] ),
 				'order_item_counts'   => array_values( $data['order_item_counts'] ),
@@ -683,30 +684,30 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 			var main_chart;
 
 			jQuery(function(){
-				var order_data = jQuery.parseJSON( '<?php echo $chart_data; ?>' );
+				var order_data = jQuery.parseJSON( '<?php echo $chart_data;  // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>' );
 				var drawGraph = function( highlight ) {
 					var series = [
 						{
 							label: "<?php echo esc_js( __( 'Number of items sold', 'woocommerce' ) ); ?>",
 							data: order_data.order_item_counts,
-							color: '<?php echo $this->chart_colours['item_count']; ?>',
-							bars: { fillColor: '<?php echo $this->chart_colours['item_count']; ?>', fill: true, show: true, lineWidth: 0, barWidth: <?php echo $this->barwidth; ?> * 0.5, align: 'center' },
+							color: '<?php echo esc_js( $this->chart_colours['item_count'] ); ?>',
+							bars: { fillColor: '<?php echo esc_js( $this->chart_colours['item_count'] ); ?>', fill: true, show: true, lineWidth: 0, barWidth: <?php echo esc_js( $this->barwidth ); ?> * 0.5, align: 'center' },
 							shadowSize: 0,
 							hoverable: false
 						},
 						{
 							label: "<?php echo esc_js( __( 'Number of orders', 'woocommerce' ) ); ?>",
 							data: order_data.order_counts,
-							color: '<?php echo $this->chart_colours['order_count']; ?>',
-							bars: { fillColor: '<?php echo $this->chart_colours['order_count']; ?>', fill: true, show: true, lineWidth: 0, barWidth: <?php echo $this->barwidth; ?> * 0.5, align: 'center' },
+							color: '<?php echo esc_js( $this->chart_colours['order_count'] ); ?>',
+							bars: { fillColor: '<?php echo esc_js( $this->chart_colours['order_count'] ); ?>', fill: true, show: true, lineWidth: 0, barWidth: <?php echo esc_js( $this->barwidth ); ?> * 0.5, align: 'center' },
 							shadowSize: 0,
 							hoverable: false
 						},
 						{
 							label: "<?php echo esc_js( __( 'Average gross sales amount', 'woocommerce' ) ); ?>",
-							data: [ [ <?php echo min( array_keys( $data['order_amounts'] ) ); ?>, <?php echo $this->report_data->average_total_sales; ?> ], [ <?php echo max( array_keys( $data['order_amounts'] ) ); ?>, <?php echo $this->report_data->average_total_sales; ?> ] ],
+							data: [ [ <?php echo esc_js( min( array_keys( $data['order_amounts'] ) ) ); ?>, <?php echo esc_js( $this->report_data->average_total_sales ); ?> ], [ <?php echo esc_js( max( array_keys( $data['order_amounts'] ) ) ); ?>, <?php echo esc_js( $this->report_data->average_total_sales ); ?> ] ],
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['average']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['average'] ); ?>',
 							points: { show: false },
 							lines: { show: true, lineWidth: 2, fill: false },
 							shadowSize: 0,
@@ -714,9 +715,9 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 						},
 						{
 							label: "<?php echo esc_js( __( 'Average net sales amount', 'woocommerce' ) ); ?>",
-							data: [ [ <?php echo min( array_keys( $data['order_amounts'] ) ); ?>, <?php echo $this->report_data->average_sales; ?> ], [ <?php echo max( array_keys( $data['order_amounts'] ) ); ?>, <?php echo $this->report_data->average_sales; ?> ] ],
+							data: [ [ <?php echo esc_js( min( array_keys( $data['order_amounts'] ) ) ); ?>, <?php echo esc_js( $this->report_data->average_sales ); ?> ], [ <?php echo esc_js( max( array_keys( $data['order_amounts'] ) ) ); ?>, <?php echo esc_js( $this->report_data->average_sales ); ?> ] ],
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['net_average']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['net_average'] ); ?>',
 							points: { show: false },
 							lines: { show: true, lineWidth: 2, fill: false },
 							shadowSize: 0,
@@ -726,51 +727,51 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 							label: "<?php echo esc_js( __( 'Coupon amount', 'woocommerce' ) ); ?>",
 							data: order_data.coupon_amounts,
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['coupon_amount']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['coupon_amount'] ); ?>',
 							points: { show: true, radius: 5, lineWidth: 2, fillColor: '#fff', fill: true },
 							lines: { show: true, lineWidth: 2, fill: false },
 							shadowSize: 0,
-							<?php echo $this->get_currency_tooltip(); ?>
+							<?php echo $this->get_currency_tooltip();  // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>
 						},
 						{
 							label: "<?php echo esc_js( __( 'Shipping amount', 'woocommerce' ) ); ?>",
 							data: order_data.shipping_amounts,
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['shipping_amount']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['shipping_amount'] ); ?>',
 							points: { show: true, radius: 5, lineWidth: 2, fillColor: '#fff', fill: true },
 							lines: { show: true, lineWidth: 2, fill: false },
 							shadowSize: 0,
-							prepend_tooltip: "<?php echo get_woocommerce_currency_symbol(); ?>"
+							prepend_tooltip: "<?php echo get_woocommerce_currency_symbol(); // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>"
 						},
 						{
 							label: "<?php echo esc_js( __( 'Gross sales amount', 'woocommerce' ) ); ?>",
 							data: order_data.gross_order_amounts,
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['sales_amount']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['sales_amount'] ); ?>',
 							points: { show: true, radius: 5, lineWidth: 2, fillColor: '#fff', fill: true },
 							lines: { show: true, lineWidth: 2, fill: false },
 							shadowSize: 0,
-							<?php echo $this->get_currency_tooltip(); ?>
+							<?php echo $this->get_currency_tooltip(); // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>
 						},
 						{
 							label: "<?php echo esc_js( __( 'Net sales amount', 'woocommerce' ) ); ?>",
 							data: order_data.net_order_amounts,
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['net_sales_amount']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['net_sales_amount'] ); ?>',
 							points: { show: true, radius: 6, lineWidth: 4, fillColor: '#fff', fill: true },
 							lines: { show: true, lineWidth: 5, fill: false },
 							shadowSize: 0,
-							<?php echo $this->get_currency_tooltip(); ?>
+							<?php echo $this->get_currency_tooltip(); // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>
 						},
 						{
 							label: "<?php echo esc_js( __( 'Refund amount', 'woocommerce' ) ); ?>",
 							data: order_data.refund_amounts,
 							yaxis: 2,
-							color: '<?php echo $this->chart_colours['refund_amount']; ?>',
+							color: '<?php echo esc_js( $this->chart_colours['refund_amount'] ); ?>',
 							points: { show: true, radius: 5, lineWidth: 2, fillColor: '#fff', fill: true },
 							lines: { show: true, lineWidth: 2, fill: false },
 							shadowSize: 0,
-							prepend_tooltip: "<?php echo get_woocommerce_currency_symbol(); ?>"
+							prepend_tooltip: "<?php echo get_woocommerce_currency_symbol(); // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?>"
 						},
 					];
 
@@ -807,9 +808,9 @@ class WC_Report_Sales_By_Date extends WC_Admin_Report {
 								tickColor: 'transparent',
 								mode: "time",
 								timeformat: "<?php echo ( 'day' === $this->chart_groupby ) ? '%d %b' : '%b'; ?>",
-								monthNames: <?php echo json_encode( array_values( $wp_locale->month_abbrev ) ); ?>,
+								monthNames: <?php echo wp_json_encode( array_values( $wp_locale->month_abbrev ) ); ?>,
 								tickLength: 1,
-								minTickSize: [1, "<?php echo $this->chart_groupby; ?>"],
+								minTickSize: [1, "<?php echo esc_js( $this->chart_groupby ); ?>"],
 								font: {
 									color: "#aaa"
 								}