diff --git a/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-controller.php b/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-controller.php
index 3d1c2421286..c46e8c84afd 100644
--- a/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-controller.php
+++ b/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-controller.php
@@ -52,8 +52,6 @@ class WC_Admin_REST_Reports_Customers_Controller extends WC_REST_Reports_Control
 		$args['country']             = $request['country'];
 		$args['last_active_before']  = $request['last_active_before'];
 		$args['last_active_after']   = $request['last_active_after'];
-		$args['last_active_min']     = $request['last_active_min'];
-		$args['last_active_max']     = $request['last_active_max'];
 		$args['orders_count_min']    = $request['orders_count_min'];
 		$args['orders_count_max']    = $request['orders_count_max'];
 		$args['total_spend_min']     = $request['total_spend_min'];
@@ -64,10 +62,10 @@ class WC_Admin_REST_Reports_Customers_Controller extends WC_REST_Reports_Control
 		$args['last_order_after']    = $request['last_order_after'];
 
 		$numeric_between_params = array( 'orders_count', 'total_spend', 'avg_order_value' );
-		$date_between_params = array( 'last_active' );
-		$normalized     = WC_Admin_Reports_Interval::normalize_numeric_between_params( $request, $numeric_between_params );
-		$normalized_dates     = WC_Admin_Reports_Interval::normalize_date_between_params( $request, $date_between_params );
-		$args           = array_merge( $args, $normalized, $normalized_dates );
+		$date_between_params    = array( 'last_active' );
+		$normalized             = WC_Admin_Reports_Interval::normalize_between_params( $request, $numeric_between_params, false );
+		$normalized_dates       = WC_Admin_Reports_Interval::normalize_between_params( $request, $date_between_params, true );
+		$args                   = array_merge( $args, $normalized, $normalized_dates );
 
 		return $args;
 	}
diff --git a/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-stats-controller.php b/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-stats-controller.php
index 8946ddeddd0..2b906f6c049 100644
--- a/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-stats-controller.php
+++ b/plugins/woocommerce-admin/includes/api/class-wc-admin-rest-reports-customers-stats-controller.php
@@ -57,7 +57,7 @@ class WC_Admin_REST_Reports_Customers_Stats_Controller extends WC_REST_Reports_C
 		$args['last_order_after']    = $request['last_order_after'];
 
 		$between_params = array( 'orders_count', 'total_spend', 'avg_order_value' );
-		$normalized     = WC_Admin_Reports_Interval::normalize_numeric_between_params( $request, $between_params );
+		$normalized     = WC_Admin_Reports_Interval::normalize_between_params( $request, $between_params );
 		$args           = array_merge( $args, $normalized );
 
 		return $args;
diff --git a/plugins/woocommerce-admin/includes/class-wc-admin-reports-interval.php b/plugins/woocommerce-admin/includes/class-wc-admin-reports-interval.php
index bf868b473cc..dcb90e23daf 100644
--- a/plugins/woocommerce-admin/includes/class-wc-admin-reports-interval.php
+++ b/plugins/woocommerce-admin/includes/class-wc-admin-reports-interval.php
@@ -498,9 +498,10 @@ class WC_Admin_Reports_Interval {
 	 *
 	 * @param array        $request Query params from REST API request.
 	 * @param string|array $param_names One or more param names to handle. Should not include "_between" suffix.
+	 * @param bool         $is_date Boolean if the param is date is related.
 	 * @return array Normalized query values.
 	 */
-	public static function normalize_numeric_between_params( $request, $param_names ) {
+	public static function normalize_between_params( $request, $param_names, $is_date ) {
 		if ( ! is_array( $param_names ) ) {
 			$param_names = array( $param_names );
 		}
@@ -518,49 +519,15 @@ class WC_Admin_Reports_Interval {
 				continue;
 			}
 
-			if ( $range[0] < $range[1] ) {
-				$normalized[ $param_name . '_min' ] = $range[0];
-				$normalized[ $param_name . '_max' ] = $range[1];
-			} else {
-				$normalized[ $param_name . '_min' ] = $range[1];
-				$normalized[ $param_name . '_max' ] = $range[0];
-			}
-		}
-
-		return $normalized;
-	}
-
-	/**
-	 * Normalize "*_between" parameters to "*_after" and "*_before".
-	 *
-	 * @param array        $request Query params from REST API request.
-	 * @param string|array $param_names One or more param names to handle. Should not include "_between" suffix.
-	 * @return array Normalized query values.
-	 */
-	public static function normalize_date_between_params( $request, $param_names ) {
-		if ( ! is_array( $param_names ) ) {
-			$param_names = array( $param_names );
-		}
-
-		$normalized = array();
-
-		foreach ( $param_names as $param_name ) {
-			if ( ! is_array( $request[ $param_name . '_between' ] ) ) {
-				continue;
-			}
-
-			$range = $request[ $param_name . '_between' ];
-
-			if ( 2 !== count( $range ) ) {
-				continue;
-			}
+			$min = $is_date ? '_after' : '_min';
+			$max = $is_date ? '_before' : '_max';
 
 			if ( $range[0] < $range[1] ) {
-				$normalized[ $param_name . '_after' ] = $range[0];
-				$normalized[ $param_name . '_before' ] = $range[1];
+				$normalized[ $param_name . $min ] = $range[0];
+				$normalized[ $param_name . $max ] = $range[1];
 			} else {
-				$normalized[ $param_name . '_after' ] = $range[1];
-				$normalized[ $param_name . '_before' ] = $range[0];
+				$normalized[ $param_name . $min ] = $range[1];
+				$normalized[ $param_name . $max ] = $range[0];
 			}
 		}
 
diff --git a/plugins/woocommerce-admin/tests/api/reports-interval.php b/plugins/woocommerce-admin/tests/api/reports-interval.php
index bcce5694f55..78db9e8c26c 100644
--- a/plugins/woocommerce-admin/tests/api/reports-interval.php
+++ b/plugins/woocommerce-admin/tests/api/reports-interval.php
@@ -813,7 +813,7 @@ class WC_Tests_Reports_Interval_Stats extends WC_Unit_Test_Case {
 	/**
 	 * Test function that normalizes *_between query parameters to *_min & *_max.
 	 */
-	public function test_normalize_numeric_between_params() {
+	public function test_normalize_between_params() {
 		$request  = array(
 			'a_between' => 'malformed',     // won't be normalized (not an array).
 			'b_between' => array( 1, 5 ),   // results in min=1, max=5.
@@ -822,7 +822,7 @@ class WC_Tests_Reports_Interval_Stats extends WC_Unit_Test_Case {
 			'f_between' => array( 10, 12 ), // not in params, skipped.
 		);
 		$params   = array( 'a', 'b', 'c', 'd' );
-		$result   = WC_Admin_Reports_Interval::normalize_numeric_between_params( $request, $params );
+		$result   = WC_Admin_Reports_Interval::normalize_between_params( $request, $params );
 		$expected = array(
 			'b_min' => 1,
 			'b_max' => 5,