diff --git a/CHANGELOG.md b/CHANGELOG.md
index bafce5c44..e43a252bd 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 * 【core   】      CollUtil.subtract增加空判定（issue#3605@Github）
 * 【core   】      优化DateUtil.format(Date date, String format)接口效率（pr#1226@Gitee）
 * 【csv    】      CsvWriter.writeBeans增加重载，可选是否写出表头（issue#IA57W2@Gitee）
+* 【core   】      BetweenFormatter支持自定义设置单位（pr#1228@Gitee）
 
 ### 🐞Bug修复
 * 【core   】      修复AnnotationUtil可能的空指针错误
diff --git a/hutool-core/src/main/java/cn/hutool/core/date/BetweenFormatter.java b/hutool-core/src/main/java/cn/hutool/core/date/BetweenFormatter.java
index 2421b0946..5d8b138e5 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/BetweenFormatter.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/BetweenFormatter.java
@@ -19,10 +19,6 @@ import java.util.function.Function;
 public class BetweenFormatter implements Serializable {
 	private static final long serialVersionUID = 1L;
 
-	/**
-	 * 单位格式化器
-	 */
-	public static Function<Level, String> DEFAULT_LEVEL_FORMATTER = (level) -> level.name;
 	/**
 	 * 时长毫秒数
 	 */
@@ -38,7 +34,7 @@ public class BetweenFormatter implements Serializable {
 	/**
 	 * 格式化器
 	 */
-	private Function<Level, String> levelFormatter = DEFAULT_LEVEL_FORMATTER;
+	private Function<Level, String> levelFormatter = Level::getName;
 	/**
 	 * 分隔符
 	 */
@@ -86,7 +82,7 @@ public class BetweenFormatter implements Serializable {
 			final int level = this.level.ordinal();
 			int levelCount = 0;
 
-			if (isLevelCountValid(levelCount) && 0 != day && level >= Level.DAY.ordinal()) {
+			if (isLevelCountValid(levelCount) && day > 0) {
 				sb.append(day).append(levelFormatter.apply(Level.DAY)).append(separator);
 				levelCount++;
 			}
@@ -172,7 +168,7 @@ public class BetweenFormatter implements Serializable {
 	 * @return this
 	 */
 	public BetweenFormatter setSeparator(String separator) {
-		this.separator = separator == null ? StrUtil.EMPTY : separator;
+		this.separator = StrUtil.nullToEmpty(separator);
 		return this;
 	}