diff --git a/hutool-core/src/main/java/cn/hutool/v7/core/date/DateBetween.java b/hutool-core/src/main/java/cn/hutool/v7/core/date/DateBetween.java
index 967fcf340d..645e2bad23 100644
--- a/hutool-core/src/main/java/cn/hutool/v7/core/date/DateBetween.java
+++ b/hutool-core/src/main/java/cn/hutool/v7/core/date/DateBetween.java
@@ -35,11 +35,11 @@ public class DateBetween implements Serializable {
 	/**
 	 * 开始日期
 	 */
-	private final Date begin;
+	private final long begin;
 	/**
 	 * 结束日期
 	 */
-	private final Date end;
+	private final long end;
 
 	/**
 	 * 创建<br>
@@ -94,11 +94,11 @@ public class DateBetween implements Serializable {
 
 		if (isAbs && begin.after(end)) {
 			// 间隔只为正数的情况下，如果开始日期晚于结束日期，置换之
-			this.begin = end;
-			this.end = begin;
+			this.begin = end.getTime();
+			this.end = begin.getTime();
 		} else {
-			this.begin = begin;
-			this.end = end;
+			this.begin = begin.getTime();
+			this.end = end.getTime();
 		}
 	}
 
@@ -110,7 +110,7 @@ public class DateBetween implements Serializable {
 	 * @return 时长差
 	 */
 	public long between(final DateUnit unit) {
-		final long diff = end.getTime() - begin.getTime();
+		final long diff = end - begin;
 		return diff / unit.getMillis();
 	}
 
@@ -183,8 +183,8 @@ public class DateBetween implements Serializable {
 	 *
 	 * @return 获取开始时间
 	 */
-	public Date getBegin() {
-		return begin;
+	public Date getBeginDate() {
+		return DateUtil.date(begin);
 	}
 
 	/**
@@ -192,8 +192,8 @@ public class DateBetween implements Serializable {
 	 *
 	 * @return 结束日期
 	 */
-	public Date getEnd() {
-		return end;
+	public Date getEndDate() {
+		return DateUtil.date(end);
 	}
 
 	/**
diff --git a/hutool-core/src/test/java/cn/hutool/v7/core/date/DateBetweenTest.java b/hutool-core/src/test/java/cn/hutool/v7/core/date/DateBetweenTest.java
index 4dbb6f1bfc..056c95b951 100644
--- a/hutool-core/src/test/java/cn/hutool/v7/core/date/DateBetweenTest.java
+++ b/hutool-core/src/test/java/cn/hutool/v7/core/date/DateBetweenTest.java
@@ -16,12 +16,13 @@
 
 package cn.hutool.v7.core.date;
 
-import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 import java.time.temporal.ChronoUnit;
 import java.util.Date;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 public class DateBetweenTest {
 
 	@Test
@@ -29,18 +30,18 @@ public class DateBetweenTest {
 		final Date start = DateUtil.parse("2017-02-01 12:23:46");
 		final Date end = DateUtil.parse("2018-02-01 12:23:46");
 		final long betweenYear = new DateBetween(start, end).betweenYear(false);
-		Assertions.assertEquals(1, betweenYear);
+		assertEquals(1, betweenYear);
 
 		final Date start1 = DateUtil.parse("2017-02-01 12:23:46");
 		final Date end1 = DateUtil.parse("2018-03-01 12:23:46");
 		final long betweenYear1 = new DateBetween(start1, end1).betweenYear(false);
-		Assertions.assertEquals(1, betweenYear1);
+		assertEquals(1, betweenYear1);
 
 		// 不足1年
 		final Date start2 = DateUtil.parse("2017-02-01 12:23:46");
 		final Date end2 = DateUtil.parse("2018-02-01 11:23:46");
 		final long betweenYear2 = new DateBetween(start2, end2).betweenYear(false);
-		Assertions.assertEquals(0, betweenYear2);
+		assertEquals(0, betweenYear2);
 	}
 
 	@Test
@@ -48,7 +49,7 @@ public class DateBetweenTest {
 		final Date start = DateUtil.parse("2000-02-29");
 		final Date end = DateUtil.parse("2018-02-28");
 		final long betweenYear = new DateBetween(start, end).betweenYear(false);
-		Assertions.assertEquals(18, betweenYear);
+		assertEquals(18, betweenYear);
 	}
 
 	@Test
@@ -59,7 +60,7 @@ public class DateBetweenTest {
 		final Date edate = DateUtil.parse(dateStr2);
 
 		final long result = DateUtil.betweenYear(sdate, edate, false);
-		Assertions.assertEquals(0, result);
+		assertEquals(0, result);
 	}
 
 	@Test
@@ -70,7 +71,7 @@ public class DateBetweenTest {
 		final Date edate = DateUtil.parse(dateStr2);
 
 		final long result = DateUtil.betweenYear(sdate, edate, false);
-		Assertions.assertEquals(1, result);
+		assertEquals(1, result);
 	}
 
 	@Test
@@ -82,7 +83,7 @@ public class DateBetweenTest {
 		final Date edate = DateUtil.parse(dateStr2);
 
 		final long result = DateUtil.betweenYear(sdate, edate, false);
-		Assertions.assertEquals(0, result);
+		assertEquals(0, result);
 	}
 
 	@Test
@@ -90,18 +91,18 @@ public class DateBetweenTest {
 		final Date start = DateUtil.parse("2017-02-01 12:23:46");
 		final Date end = DateUtil.parse("2018-02-01 12:23:46");
 		final long betweenMonth = new DateBetween(start, end).betweenMonth(false);
-		Assertions.assertEquals(12, betweenMonth);
+		assertEquals(12, betweenMonth);
 
 		final Date start1 = DateUtil.parse("2017-02-01 12:23:46");
 		final Date end1 = DateUtil.parse("2018-03-01 12:23:46");
 		final long betweenMonth1 = new DateBetween(start1, end1).betweenMonth(false);
-		Assertions.assertEquals(13, betweenMonth1);
+		assertEquals(13, betweenMonth1);
 
 		// 不足
 		final Date start2 = DateUtil.parse("2017-02-01 12:23:46");
 		final Date end2 = DateUtil.parse("2018-02-01 11:23:46");
 		final long betweenMonth2 = new DateBetween(start2, end2).betweenMonth(false);
-		Assertions.assertEquals(11, betweenMonth2);
+		assertEquals(11, betweenMonth2);
 	}
 
 	@Test
@@ -109,7 +110,7 @@ public class DateBetweenTest {
 		final Date date1 = DateUtil.parse("2017-03-01 20:33:23");
 		final Date date2 = DateUtil.parse("2017-03-01 23:33:23");
 		final String formatBetween = DateUtil.formatBetween(date1, date2, BetweenFormatter.Level.SECOND);
-		Assertions.assertEquals("3小时", formatBetween);
+		assertEquals("3小时", formatBetween);
 	}
 
 	@Test
@@ -122,6 +123,19 @@ public class DateBetweenTest {
 				TimeUtil.parse("2020-11-21", "yyy-MM-dd"),
 				TimeUtil.parse("2020-11-23", "yyy-MM-dd"),
 				ChronoUnit.WEEKS);
-		Assertions.assertEquals(betweenWeek, betweenWeek2);
+		assertEquals(betweenWeek, betweenWeek2);
+	}
+
+	@Test
+	public void issueIDFVKGTest() {
+		Date b = new Date(1609459200000L); // 2021-01-01 00:00:00
+		Date e = new Date(1609545600000L); // 2021-01-02 00:00:00
+		DateBetween db = new DateBetween(b, e);
+
+		// 修改原始 date
+		b.setTime(0L); // 1970-01-01
+
+		// 期望 DateBetween 不受影响，间隔仍为 1 天
+		assertEquals(1, db.between(DateUnit.DAY));
 	}
 }