Fix ZonedDateTime issue with DST

Author: BenMorel

src/ZonedDateTime.php

@@ -482,39 +482,39 @@ public function plusMonths(int $months): ZonedDateTime
      */
     public function plusWeeks(int $weeks): ZonedDateTime
     {
-        return ZonedDateTime::of($this->localDateTime->plusWeeks($weeks), $this->timeZone);
+        return ZonedDateTime::ofInstant($this->instant->plusDays($weeks * 7), $this->timeZone);
     }
 
     /**
      * Returns a copy of this ZonedDateTime with the specified period in days added.
      */
     public function plusDays(int $days): ZonedDateTime
     {
-        return ZonedDateTime::of($this->localDateTime->plusDays($days), $this->timeZone);
+        return ZonedDateTime::ofInstant($this->instant->plusDays($days), $this->timeZone);
     }
 
     /**
      * Returns a copy of this ZonedDateTime with the specified period in hours added.
      */
     public function plusHours(int $hours): ZonedDateTime
     {
-        return ZonedDateTime::of($this->localDateTime->plusHours($hours), $this->timeZone);
+        return ZonedDateTime::ofInstant($this->instant->plusHours($hours), $this->timeZone);
     }
 
     /**
      * Returns a copy of this ZonedDateTime with the specified period in minutes added.
      */
     public function plusMinutes(int $minutes): ZonedDateTime
     {
-        return ZonedDateTime::of($this->localDateTime->plusMinutes($minutes), $this->timeZone);
+        return ZonedDateTime::ofInstant($this->instant->plusMinutes($minutes), $this->timeZone);
     }
 
     /**
      * Returns a copy of this ZonedDateTime with the specified period in seconds added.
      */
     public function plusSeconds(int $seconds): ZonedDateTime
     {
-        return ZonedDateTime::of($this->localDateTime->plusSeconds($seconds), $this->timeZone);
+        return ZonedDateTime::ofInstant($this->instant->plusSeconds($seconds), $this->timeZone);
     }
 
     /**

tests/ZonedDateTimeTest.php

@@ -669,9 +669,21 @@ public function testPlusHours(): void
         self::assertIs(ZonedDateTime::class, '2000-01-20T14:34:56.123456789-08:00[America/Los_Angeles]', $this->getTestZonedDateTime()->plusHours(2));
     }
 
-    public function testPlusMinutes(): void
+    #[DataProvider('providerPlusMinutes')]
+    public function testPlusMinutes(string $zonedDateTime, int $plusMinutes, string $expected): void
     {
-        self::assertIs(ZonedDateTime::class, '2000-01-20T12:36:56.123456789-08:00[America/Los_Angeles]', $this->getTestZonedDateTime()->plusMinutes(2));
+        $actual = ZonedDateTime::parse($zonedDateTime)->plusMinutes($plusMinutes);
+        self::assertIs(ZonedDateTime::class, $expected, $actual);
+    }
+
+    public function providerPlusMinutes(): array
+    {
+        return [
+            ['2000-01-20T12:34:56.123456789-08:00[America/Los_Angeles]', 2, '2000-01-20T12:36:56.123456789-08:00[America/Los_Angeles]'],
+            // https://github.com/brick/date-time/issues/115
+            ['2025-03-30T01:30+01:00[Europe/Prague]', 50, '2025-03-30T03:20+02:00[Europe/Prague]'],
+            ['2025-03-30T01:30+01:00[Europe/Prague]', 100, '2025-03-30T04:10+02:00[Europe/Prague]'],
+        ];
     }
 
     public function testPlusSeconds(): void