Support SUN as minimum of range in CronExpression

This commit makes sure that SUN can be used at the beginning of a range,
 like SUN-FRI.

Closes gh-26598

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

@@ -165,6 +165,10 @@ final class BitsCronField extends CronField {
 				int max = Integer.parseInt(value.substring(hyphenPos + 1));
 				min = type.checkValidValue(min);
 				max = type.checkValidValue(max);
+				if (type == Type.DAY_OF_WEEK && min == 7) {
+					// If used as a minimum in a range, Sunday means 0 (not 7)
+					min = 0;
+				}
 				return ValueRange.of(min, max);
 			}
 		}

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

@@ -48,6 +48,8 @@ class BitsCronFieldTests {
 		assertThat(BitsCronField.parseMonth("1")).has(set(1)).has(clearRange(2, 12));
 
 		assertThat(BitsCronField.parseDaysOfWeek("0")).has(set(7, 7)).has(clearRange(0, 6));
+
+		assertThat(BitsCronField.parseDaysOfWeek("7-5")).has(clear(0)).has(setRange(1, 5)).has(clear(6)).has(set(7));
 	}
 
 	@Test

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

@@ -1242,5 +1242,25 @@ class CronExpressionTests {
 		assertThat(actual).isEqualTo(expected);
 	}
 
+	@Test
+	public void sundayToFriday() {
+		CronExpression expression = CronExpression.parse("0 0 0 ? * SUN-FRI");
+
+		LocalDateTime last = LocalDateTime.of(2021, 2, 25, 15, 0);
+		LocalDateTime expected = LocalDateTime.of(2021, 2, 26, 0, 0);
+		LocalDateTime actual = expression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+		assertThat(actual.getDayOfWeek()).isEqualTo(FRIDAY);
+
+		last = actual;
+		expected = LocalDateTime.of(2021, 2, 28, 0, 0);
+		actual = expression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+		assertThat(actual.getDayOfWeek()).isEqualTo(SUNDAY);
+	}
+
+
 
 }