Index: forgon-tools/src/main/java/com/forgon/tools/util/ForgonDateUtils.java
===================================================================
diff -u -r38140 -r41191
--- forgon-tools/src/main/java/com/forgon/tools/util/ForgonDateUtils.java	(.../ForgonDateUtils.java)	(revision 38140)
+++ forgon-tools/src/main/java/com/forgon/tools/util/ForgonDateUtils.java	(.../ForgonDateUtils.java)	(revision 41191)
@@ -24,19 +24,30 @@
  */
 public class ForgonDateUtils {
 
+	public static final String DATE_FORMAT_YYYYMMDDHHMMSS = "yyyy-MM-dd HH:mm:ss";
+	public static final String DATE_FORMAT_YYYYMMDDHHMM = "yyyy-MM-dd HH:mm";
+	public static final String DATE_FORMAT_YYYYMMDD = "yyyy-MM-dd";
+	public static final String DATE_FORMAT_YYYYMM = "yyyy-MM";
+	public static final String DATE_FORMAT_YYYY = "yyyy";
 	/**
 	 * 这里由于项目依赖关系,重新定义了一份,跟com.forgon.Constants中的定义是一样的
+	 * @deprecated SimpleDateFormat不是线程安全的.应该使用线程局部变量或者使用java8的java.time包
 	 */
+	@Deprecated
 	public final static SimpleDateFormat SIMPLEDATEFORMAT_YYYYMMDDHHMMSS = new SimpleDateFormat(
-			"yyyy-MM-dd HH:mm:ss");
+			DATE_FORMAT_YYYYMMDDHHMMSS);
+	@Deprecated
 	public final static SimpleDateFormat SIMPLEDATEFORMAT_YYYYMMDDHHMM = new SimpleDateFormat(
-			"yyyy-MM-dd HH:mm");
+			DATE_FORMAT_YYYYMMDDHHMM);
+	@Deprecated
 	public final static SimpleDateFormat SIMPLEDATEFORMAT_YYYYMMDD = new SimpleDateFormat(
-			"yyyy-MM-dd");
+			DATE_FORMAT_YYYYMMDD);
+	@Deprecated
 	public final static SimpleDateFormat SIMPLEDATEFORMAT_YYYYMM = new SimpleDateFormat(
-			"yyyy-MM");
+			DATE_FORMAT_YYYYMM);
+	@Deprecated
 	public final static SimpleDateFormat SIMPLEDATEFORMAT_YYYY = new SimpleDateFormat(
-			"yyyy");
+			DATE_FORMAT_YYYY);
 	
 	/**
 	 * 根据给定的时间格式，把String型转成Date类型，若转换成不成功则返回null..
@@ -75,7 +86,9 @@
 	 * 尝试用最大精度的日期格式转换,从有秒=》分=》时=》日=》月=》年，如果都没有尝试转换成功，返回当前时间
 	 * @param dateStr
 	 * @return
+	 * @deprecated SimpleDateFormat不是线程安全的.应该使用线程局部变量或者使用java8的java.time包
 	 */
+	@Deprecated
 	public static Date safelyParseDate(String dateStr){
 		Date date = safelyParseDate(dateStr,SIMPLEDATEFORMAT_YYYYMMDDHHMMSS);
 		if(date == null){
Index: forgon-tools/src/test/java/com/forgon/tools/util/SimpleDateFormatThreadUnsafeTest.java
===================================================================
diff -u
--- forgon-tools/src/test/java/com/forgon/tools/util/SimpleDateFormatThreadUnsafeTest.java	(revision 0)
+++ forgon-tools/src/test/java/com/forgon/tools/util/SimpleDateFormatThreadUnsafeTest.java	(revision 41191)
@@ -0,0 +1,34 @@
+package com.forgon.tools.util;
+
+import org.junit.Test;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+public class SimpleDateFormatThreadUnsafeTest {
+    private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
+
+    @Test
+    public void testThreadSafety() throws InterruptedException {
+        ExecutorService executor = Executors.newFixedThreadPool(10);
+
+        for (int i = 0; i < 10; i++) {
+            final int index = i;
+            executor.submit(() -> {
+                try {
+                    // 多线程同时使用同一个 SimpleDateFormat 实例
+                    Date date = sdf.parse("2024-01-" + (index + 1));
+                    System.out.println(Thread.currentThread().getName() + ": " + date);
+                } catch (Exception e) {
+                    System.err.println(Thread.currentThread().getName() + " 出错: " + e.getMessage());
+                }
+            });
+        }
+
+        executor.shutdown();
+        executor.awaitTermination(1, TimeUnit.MINUTES);
+    }
+}