symfony
diff --git a/‎src/Symfony/Component/Clock/MockClock.php
Lines changed: 2 additions & 13 deletions b/‎src/Symfony/Component/Clock/MockClock.php
Lines changed: 2 additions & 13 deletions
diff --git a/‎src/Symfony/Component/Clock/Tests/MockClockTest.php
Lines changed: 15 additions & 3 deletions b/‎src/Symfony/Component/Clock/Tests/MockClockTest.php
Lines changed: 15 additions & 3 deletions
@@ -40,21 +40,10 @@ public function now(): \DateTimeImmutable
 
     public function sleep(float|int $seconds): void
     {
-        $now = explode('.', $this->now->format('U.u'));
-
-        if (0 < $s = (int) $seconds) {
-            $now[0] += $s;
-        }
-
-        if (0 < ($us = $seconds - $s) && 1E6 <= $now[1] += $us * 1E6) {
-            ++$now[0];
-            $now[1] -= 1E6;
-        }
-
-        $datetime = '@'.$now[0].'.'.str_pad($now[1], 6, '0', \STR_PAD_LEFT);
+        $datetime = ((float) $this->now->format('Uu') + $seconds * 1e6) / 1e6;
         $timezone = $this->now->getTimezone();
 
-        $this->now = (new \DateTimeImmutable($datetime, $timezone))->setTimezone($timezone);
+        $this->now = (new \DateTimeImmutable(sprintf('@%.6F', $datetime), $timezone))->setTimezone($timezone);
     }
 
     public function withTimeZone(\DateTimeZone|string $timezone): static
 
@@ -55,14 +55,26 @@ public function testNow()
 
     public function testSleep()
     {
-        $clock = new MockClock((new \DateTimeImmutable('@123.456'))->setTimezone(new \DateTimeZone('UTC')));
+        // The maximum value without losing precision is 2112-09-17 23:53:47.370496
+        $clock = new MockClock((new \DateTimeImmutable('2112-09-17 23:53:00.999Z'))->setTimezone(new \DateTimeZone('UTC')));
         $tz = $clock->now()->getTimezone()->getName();
 
-        $clock->sleep(4.999);
-        $this->assertSame('128.455000', $clock->now()->format('U.u'));
+        $clock->sleep(2.002001);
+        $this->assertSame('2112-09-17 23:53:03.001001', $clock->now()->format('Y-m-d H:i:s.u'));
         $this->assertSame($tz, $clock->now()->getTimezone()->getName());
     }
 
+    public function testPrecisionSleep()
+    {
+        $precision = \ini_get('precision');
+        ini_set('precision', -1);
+        try {
+            $this->testSleep();
+        } finally {
+            ini_set('precision', $precision);
+        }
+    }
+
     public function testWithTimeZone()
     {
         $clock = new MockClock();