diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a6d855fd..bdea9025b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 * 【core   】     修复FileUtil.normalize处理上级路径的问题（issue#I3YPEH@Gitee）
 * 【core   】     修复ClassScanner扫描空包遗漏问题
 * 【core   】     修复FastDatePrinter歧义问题（pr#366@Gitee）
+* 【core   】     修复DateUtil.format格式化Instant报错问题（issue#I40CY2@Gitee）
 
 -------------------------------------------------------------------------------------------------------------
 
diff --git a/hutool-core/src/main/java/cn/hutool/core/date/DatePattern.java b/hutool-core/src/main/java/cn/hutool/core/date/DatePattern.java
index 236435ead..8feeac0ce 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/DatePattern.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DatePattern.java
@@ -2,6 +2,7 @@ package cn.hutool.core.date;
 
 import cn.hutool.core.date.format.FastDateFormat;
 
+import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
 import java.util.Locale;
 import java.util.TimeZone;
@@ -39,7 +40,7 @@ public class DatePattern {
 	/**
 	 * 年月格式 {@link FastDateFormat}：yyyy-MM
 	 */
-	public static final DateTimeFormatter NORM_MONTH_FORMATTER = DateTimeFormatter.ofPattern(NORM_MONTH_PATTERN);
+	public static final DateTimeFormatter NORM_MONTH_FORMATTER = createFormatter(NORM_MONTH_PATTERN);
 
 	/**
 	 * 简单年月格式：yyyyMM
@@ -52,7 +53,7 @@ public class DatePattern {
 	/**
 	 * 简单年月格式 {@link FastDateFormat}：yyyyMM
 	 */
-	public static final DateTimeFormatter SIMPLE_MONTH_FORMATTER = DateTimeFormatter.ofPattern(SIMPLE_MONTH_PATTERN);
+	public static final DateTimeFormatter SIMPLE_MONTH_FORMATTER = createFormatter(SIMPLE_MONTH_PATTERN);
 
 	/**
 	 * 标准日期格式：yyyy-MM-dd
@@ -65,7 +66,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyy-MM-dd
 	 */
-	public static final DateTimeFormatter NORM_DATE_FORMATTER = DateTimeFormatter.ofPattern(NORM_DATE_PATTERN);
+	public static final DateTimeFormatter NORM_DATE_FORMATTER = createFormatter(NORM_DATE_PATTERN);
 
 	/**
 	 * 标准时间格式：HH:mm:ss
@@ -78,7 +79,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：HH:mm:ss
 	 */
-	public static final DateTimeFormatter NORM_TIME_FORMATTER = DateTimeFormatter.ofPattern(NORM_TIME_PATTERN);
+	public static final DateTimeFormatter NORM_TIME_FORMATTER = createFormatter(NORM_TIME_PATTERN);
 
 	/**
 	 * 标准日期时间格式，精确到分：yyyy-MM-dd HH:mm
@@ -91,7 +92,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyy-MM-dd HH:mm
 	 */
-	public static final DateTimeFormatter NORM_DATETIME_MINUTE_FORMATTER = DateTimeFormatter.ofPattern(NORM_DATETIME_MINUTE_PATTERN);
+	public static final DateTimeFormatter NORM_DATETIME_MINUTE_FORMATTER = createFormatter(NORM_DATETIME_MINUTE_PATTERN);
 
 	/**
 	 * 标准日期时间格式，精确到秒：yyyy-MM-dd HH:mm:ss
@@ -104,7 +105,7 @@ public class DatePattern {
 	/**
 	 * 标准日期时间格式，精确到秒 {@link FastDateFormat}：yyyy-MM-dd HH:mm:ss
 	 */
-	public static final DateTimeFormatter NORM_DATETIME_FORMATTER = DateTimeFormatter.ofPattern(NORM_DATETIME_PATTERN);
+	public static final DateTimeFormatter NORM_DATETIME_FORMATTER = createFormatter(NORM_DATETIME_PATTERN);
 
 	/**
 	 * 标准日期时间格式，精确到毫秒：yyyy-MM-dd HH:mm:ss.SSS
@@ -117,7 +118,7 @@ public class DatePattern {
 	/**
 	 * 标准日期时间格式，精确到毫秒 {@link FastDateFormat}：yyyy-MM-dd HH:mm:ss.SSS
 	 */
-	public static final DateTimeFormatter NORM_DATETIME_MS_FORMATTER = DateTimeFormatter.ofPattern(NORM_DATETIME_MS_PATTERN);
+	public static final DateTimeFormatter NORM_DATETIME_MS_FORMATTER = createFormatter(NORM_DATETIME_MS_PATTERN);
 
 	/**
 	 * ISO8601日期时间格式，精确到毫秒：yyyy-MM-dd HH:mm:ss,SSS
@@ -130,7 +131,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyy-MM-dd HH:mm:ss,SSS
 	 */
-	public static final DateTimeFormatter ISO8601_FORMATTER = DateTimeFormatter.ofPattern(ISO8601_PATTERN);
+	public static final DateTimeFormatter ISO8601_FORMATTER = createFormatter(ISO8601_PATTERN);
 
 	/**
 	 * 标准日期格式：yyyy年MM月dd日
@@ -143,7 +144,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyy年MM月dd日
 	 */
-	public static final DateTimeFormatter CHINESE_DATE_FORMATTER = DateTimeFormatter.ofPattern(ISO8601_PATTERN);
+	public static final DateTimeFormatter CHINESE_DATE_FORMATTER = createFormatter(ISO8601_PATTERN);
 
 	/**
 	 * 标准日期格式：yyyy年MM月dd日 HH时mm分ss秒
@@ -156,7 +157,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyy年MM月dd日HH时mm分ss秒
 	 */
-	public static final DateTimeFormatter CHINESE_DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern(CHINESE_DATE_TIME_PATTERN);
+	public static final DateTimeFormatter CHINESE_DATE_TIME_FORMATTER = createFormatter(CHINESE_DATE_TIME_PATTERN);
 
 	//-------------------------------------------------------------------------------------------------------------------------------- Pure
 	/**
@@ -170,7 +171,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyyMMdd
 	 */
-	public static final DateTimeFormatter PURE_DATE_FORMATTER = DateTimeFormatter.ofPattern(PURE_DATE_PATTERN);
+	public static final DateTimeFormatter PURE_DATE_FORMATTER = createFormatter(PURE_DATE_PATTERN);
 
 	/**
 	 * 标准日期格式：HHmmss
@@ -183,7 +184,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：HHmmss
 	 */
-	public static final DateTimeFormatter PURE_TIME_FORMATTER = DateTimeFormatter.ofPattern(PURE_TIME_PATTERN);
+	public static final DateTimeFormatter PURE_TIME_FORMATTER = createFormatter(PURE_TIME_PATTERN);
 
 	/**
 	 * 标准日期格式：yyyyMMddHHmmss
@@ -196,7 +197,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyyMMddHHmmss
 	 */
-	public static final DateTimeFormatter PURE_DATETIME_FORMATTER = DateTimeFormatter.ofPattern(PURE_DATETIME_PATTERN);
+	public static final DateTimeFormatter PURE_DATETIME_FORMATTER = createFormatter(PURE_DATETIME_PATTERN);
 
 	/**
 	 * 标准日期格式：yyyyMMddHHmmssSSS
@@ -209,7 +210,7 @@ public class DatePattern {
 	/**
 	 * 标准日期格式 {@link FastDateFormat}：yyyyMMddHHmmssSSS
 	 */
-	public static final DateTimeFormatter PURE_DATETIME_MS_FORMATTER = DateTimeFormatter.ofPattern(PURE_DATETIME_MS_PATTERN);
+	public static final DateTimeFormatter PURE_DATETIME_MS_FORMATTER = createFormatter(PURE_DATETIME_MS_PATTERN);
 
 	//-------------------------------------------------------------------------------------------------------------------------------- Others
 	/**
@@ -283,4 +284,16 @@ public class DatePattern {
 	 * UTC时间{@link FastDateFormat}：yyyy-MM-dd'T'HH:mm:ssZ
 	 */
 	public static final FastDateFormat UTC_MS_WITH_ZONE_OFFSET_FORMAT = FastDateFormat.getInstance(UTC_MS_WITH_ZONE_OFFSET_PATTERN, TimeZone.getTimeZone("UTC"));
+
+	/**
+	 * 创建并为 {@link DateTimeFormatter} 赋予默认时区和位置信息，默认值为系统默认值。
+	 *
+	 * @param pattern 日期格式
+	 * @return {@link DateTimeFormatter}
+	 * @since 5.7.5
+	 */
+	private static DateTimeFormatter createFormatter(String pattern) {
+		return DateTimeFormatter.ofPattern(pattern, Locale.getDefault())
+				.withZone(ZoneId.systemDefault());
+	}
 }
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 a81d2af2a..32daa37cf 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
@@ -541,7 +541,7 @@ public class DateUtil extends CalendarUtil {
 		if (null == format || null == date) {
 			return null;
 		}
-		return format.format(date.toInstant());
+		return TemporalAccessorUtil.format(date.toInstant(), format);
 	}
 
 	/**
diff --git a/hutool-core/src/main/java/cn/hutool/core/date/TemporalAccessorUtil.java b/hutool-core/src/main/java/cn/hutool/core/date/TemporalAccessorUtil.java
index e6d33578a..f2918c55e 100644
--- a/hutool-core/src/main/java/cn/hutool/core/date/TemporalAccessorUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/TemporalAccessorUtil.java
@@ -56,7 +56,6 @@ public class TemporalAccessorUtil extends TemporalUtil{
 			formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
 		}
 
-
 		try {
 			return formatter.format(time);
 		} catch (UnsupportedTemporalTypeException e){
@@ -66,6 +65,9 @@ public class TemporalAccessorUtil extends TemporalUtil{
 			}else if(time instanceof LocalTime && e.getMessage().contains("YearOfEra")){
 				// 用户传入LocalTime，但是要求格式化带有日期部分，转换为LocalDateTime重试
 				return formatter.format(((LocalTime) time).atDate(LocalDate.now()));
+			} else if(time instanceof Instant){
+				// 时间戳没有时区信息，赋予默认时区
+				return formatter.format(((Instant) time).atZone(ZoneId.systemDefault()));
 			}
 			throw e;
 		}
diff --git a/hutool-core/src/main/java/cn/hutool/core/math/Calculator.java b/hutool-core/src/main/java/cn/hutool/core/math/Calculator.java
index 5a63258d6..b69fcc594 100644
--- a/hutool-core/src/main/java/cn/hutool/core/math/Calculator.java
+++ b/hutool-core/src/main/java/cn/hutool/core/math/Calculator.java
@@ -155,11 +155,7 @@ public class Calculator {
 	 * @return 优先级
 	 */
 	public boolean compare(char cur, char peek) {// 如果是peek优先级高于cur，返回true，默认都是peek优先级要低
-		boolean result = false;
-		if (operatPriority[(peek) - 40] >= operatPriority[(cur) - 40]) {
-			result = true;
-		}
-		return result;
+		return operatPriority[(peek) - 40] >= operatPriority[(cur) - 40];
 	}
 
 	/**
diff --git a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
index d80795466..25bbedf22 100644
--- a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
@@ -893,4 +893,14 @@ public class DateUtilTest {
 		// 在日期格式不匹配的时候，测试是否正常报错
 		DateUtil.parse("2020-12-23", DatePattern.PURE_DATE_PATTERN);
 	}
+
+	@Test
+	public void formatNormDateTimeFormatterTest(){
+		String format = DateUtil.format(DateUtil.parse("2021-07-14 10:05:38"), DatePattern.NORM_DATETIME_FORMATTER);
+		Assert.assertEquals("2021-07-14 10:05:38", format);
+
+		format = DateUtil.format(LocalDateTimeUtil.parse("2021-07-14T10:05:38"),
+				"yyyy-MM-dd HH:mm:ss");
+		Assert.assertEquals("2021-07-14 10:05:38", format);
+	}
 }