diff --git a/run-tests.php b/run-tests.php
index f545ec0e254ea..0e341ca762d65 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -682,13 +682,14 @@ function main(): void
     if ($test_cnt) {
         putenv('NO_INTERACTION=1');
         usort($test_files, "test_sort");
-        $start_time = time();
+        $start_timestamp = time();
+        $start_time = hrtime(true);
 
         echo "Running selected tests.\n";
 
         $test_idx = 0;
         run_all_tests($test_files, $environment);
-        $end_time = time();
+        $end_time = hrtime(true);
 
         if ($failed_tests_file) {
             fclose($failed_tests_file);
@@ -730,13 +731,14 @@ function main(): void
         $test_files = array_unique($test_files);
         usort($test_files, "test_sort");
 
-        $start_time = time();
+        $start_timestamp = time();
+        $start_time = hrtime(true);
         show_start($start_time);
 
         $test_cnt = count($test_files);
         $test_idx = 0;
         run_all_tests($test_files, $environment);
-        $end_time = time();
+        $end_time = hrtime(true);
 
         if ($failed_tests_file) {
             fclose($failed_tests_file);
@@ -755,7 +757,7 @@ function main(): void
 
         compute_summary();
 
-        show_end($end_time);
+        show_end($start_timestamp, $start_time, $end_time);
         show_summary();
 
         save_results($output_file, /* prompt_to_save_results: */ true);
@@ -3064,7 +3066,7 @@ function get_summary(bool $show_ext_summary): string
     $summary .= '
 Tests passed    : ' . sprintf('%5d (%5.1f%%)', $sum_results['PASSED'], $percent_results['PASSED']) . ' ' . sprintf('(%5.1f%%)', $x_passed) . '
 ---------------------------------------------------------------------
-Time taken      : ' . sprintf('%5d seconds', $end_time - $start_time) . '
+Time taken      : ' . sprintf('%5.3f seconds', ($end_time - $start_time) / 1e9) . '
 =====================================================================
 ';
     $failed_test_summary = '';
@@ -3167,14 +3169,14 @@ function get_summary(bool $show_ext_summary): string
     return $summary;
 }
 
-function show_start(int $start_time): void
+function show_start(int $start_timestamp): void
 {
-    echo "TIME START " . date('Y-m-d H:i:s', $start_time) . "\n=====================================================================\n";
+    echo "TIME START " . date('Y-m-d H:i:s', $start_timestamp) . "\n=====================================================================\n";
 }
 
-function show_end(int $end_time): void
+function show_end(int $start_timestamp, int|float $start_time, int|float $end_time): void
 {
-    echo "=====================================================================\nTIME END " . date('Y-m-d H:i:s', $end_time) . "\n";
+    echo "=====================================================================\nTIME END " . date('Y-m-d H:i:s', $start_timestamp + (int)(($end_time - $start_time)/1e9)) . "\n";
 }
 
 function show_summary(): void