Fix CronExpression issue with ZonedDateTime & DST

This commit fixes an issue with CronExpression when used in combination
with ZonedDateTime and daylight saving time.

Closes spring-projectsgh-26744

spring-context/src/main/java/org/springframework/scheduling/support/CronField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -237,7 +237,12 @@ public int checkValidValue(int value) {
 		public <T extends Temporal & Comparable<? super T>> T elapseUntil(T temporal, int goal) {
 			int current = get(temporal);
 			if (current < goal) {
-				return this.field.getBaseUnit().addTo(temporal, goal - current);
+				T result = this.field.getBaseUnit().addTo(temporal, goal - current);
+				current = get(result);
+				if (current > goal) { // can occur due to daylight saving, see gh-26744
+					result = this.field.getBaseUnit().addTo(result, goal - current);
+				}
+				return result;
 			}
 			else {
 				ValueRange range = temporal.range(this.field);

spring-context/src/test/java/org/springframework/scheduling/support/CronExpressionTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -1261,6 +1261,23 @@ public void sundayToFriday() {
 		assertThat(actual.getDayOfWeek()).isEqualTo(SUNDAY);
 	}
 
+	@Test
+	public void daylightSaving() {
+		CronExpression cronExpression = CronExpression.parse("0 0 9 * * *");
+
+		ZonedDateTime last = ZonedDateTime.parse("2021-03-27T09:00:00+01:00[Europe/Amsterdam]");
+		ZonedDateTime expected = ZonedDateTime.parse("2021-03-28T09:00:00+01:00[Europe/Amsterdam]");
+		ZonedDateTime actual = cronExpression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+
+		last = ZonedDateTime.parse("2021-10-30T09:00:00+01:00[Europe/Amsterdam]");
+		expected = ZonedDateTime.parse("2021-10-31T09:00:00+02:00[Europe/Amsterdam]");
+		actual = cronExpression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+	}
+
 
 
 }