diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2decfb5a..78412988d 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,13 +3,14 @@
 
 -------------------------------------------------------------------------------------------------------------
 
-# 5.8.3.M1 (2022-05-30)
+# 5.8.3.M1 (2022-06-05)
 
 ### 🐣新特性
 * 【extra  】     mail增加writeTimeout参数支持（issue#2355@Github）
 * 【core   】     FileTypeUtil增加pptx扩展名支持（issue#I5A0GO@Gitee）
 ### 🐞Bug修复
 * 【core   】     修复NumberUtil.isXXX空判断错误（issue#2356@Github）
+* 【core   】     修复Convert.toSBC空指针问题（issue#I5APKK@Gitee）
 
 -------------------------------------------------------------------------------------------------------------
 
diff --git a/hutool-core/src/main/java/cn/hutool/core/convert/Convert.java b/hutool-core/src/main/java/cn/hutool/core/convert/Convert.java
index 4d00a1ca8..a7ca4babb 100755
--- a/hutool-core/src/main/java/cn/hutool/core/convert/Convert.java
+++ b/hutool-core/src/main/java/cn/hutool/core/convert/Convert.java
@@ -754,23 +754,26 @@ public class Convert {
 
 	// ----------------------------------------------------------------------- 全角半角转换
 	/**
-	 * 半角转全角
+	 * 半角转全角，{@code null}返回{@code null}
 	 *
 	 * @param input String.
-	 * @return 全角字符串.
+	 * @return 全角字符串，{@code null}返回{@code null}
 	 */
 	public static String toSBC(String input) {
 		return toSBC(input, null);
 	}
 
 	/**
-	 * 半角转全角
+	 * 半角转全角，{@code null}返回{@code null}
 	 *
 	 * @param input String
 	 * @param notConvertSet 不替换的字符集合
-	 * @return 全角字符串.
+	 * @return 全角字符串，{@code null}返回{@code null}
 	 */
 	public static String toSBC(String input, Set<Character> notConvertSet) {
+		if(StrUtil.isEmpty(input)){
+			return input;
+		}
 		final char[] c = input.toCharArray();
 		for (int i = 0; i < c.length; i++) {
 			if (null != notConvertSet && notConvertSet.contains(c[i])) {
@@ -1096,7 +1099,7 @@ public class Convert {
 	/**
 	 * long转byte数组<br>
 	 * 默认以小端序转换<br>
-	 * from: https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java
+	 * from: <a href="https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java">https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java</a>
 	 *
 	 * @param longValue long值
 	 * @return byte数组
@@ -1109,7 +1112,7 @@ public class Convert {
 	/**
 	 * byte数组转long<br>
 	 * 默认以小端序转换<br>
-	 * from: https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java
+	 * from: <a href="https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java">https://stackoverflow.com/questions/4485128/how-do-i-convert-long-to-byte-and-back-in-java</a>
 	 *
 	 * @param bytes byte数组
 	 * @return long值
diff --git a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
index 553fe869c..de910dc30 100755
--- a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
@@ -1338,7 +1338,7 @@ public class DateUtil extends CalendarUtil {
 		return offset(date, DateField.HOUR_OF_DAY, offset);
 	}
 
-	/**
+	/**w
 	 * 偏移天
 	 *
 	 * @param date   日期
@@ -2101,19 +2101,6 @@ public class DateUtil extends CalendarUtil {
 		return LocalDateTimeUtil.of(date);
 	}
 
-	/**
-	 * {@link Date} 转换时区
-	 *
-	 * @param date         {@link Date}
-	 * @param zoneId{@link zoneId}
-	 * @return {@link DateTime}
-	 * @see DateTime(Date,ZoneId)
-	 * @since 5.0.5
-	 */
-	public static DateTime convertTimeZone(Date date, String zoneId) {
-		return new DateTime(date, ZoneUtil.toTimeZone(ZoneId.of(zoneId)));
-	}
-
 	/**
 	 * {@link Date} 转换时区
 	 *
@@ -2121,7 +2108,7 @@ public class DateUtil extends CalendarUtil {
 	 * @param zoneId{@link zoneId}
 	 * @return {@link DateTime}
 	 * @see DateTime(Date, ZoneId )
-	 * @since 5.0.5
+	 * @since 5.8.3
 	 */
 	public static DateTime convertTimeZone(Date date, ZoneId zoneId) {
 		return new DateTime(date, ZoneUtil.toTimeZone(zoneId));
@@ -2134,7 +2121,7 @@ public class DateUtil extends CalendarUtil {
 	 * @param timeZone{@link timeZone}
 	 * @return {@link DateTime}
 	 * @see DateTime(Date,ZoneId)
-	 * @since 5.0.5
+	 * @since 5.8.3
 	 */
 	public static DateTime convertTimeZone(Date date, TimeZone timeZone) {
 		return new DateTime(date, timeZone);
diff --git a/hutool-core/src/test/java/cn/hutool/core/convert/ConvertTest.java b/hutool-core/src/test/java/cn/hutool/core/convert/ConvertTest.java
index 89ab9421f..047540888 100755
--- a/hutool-core/src/test/java/cn/hutool/core/convert/ConvertTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/convert/ConvertTest.java
@@ -392,4 +392,16 @@ public class ConvertTest {
 		final LocalDate convert = Convert.convert(LocalDate.class, localDateTime);
 		Assert.assertEquals(localDateTime.toLocalDate(), convert);
 	}
+
+	@Test
+	public void toSBCTest(){
+		final String s = Convert.toSBC(null);
+		Assert.assertNull(s);
+	}
+
+	@Test
+	public void toDBCTest(){
+		final String s = Convert.toDBC(null);
+		Assert.assertNull(s);
+	}
 }