[improve] optimize DateUtil and add test case

alerter/src/main/java/org/apache/hertzbeat/alert/dto/GeneralCloudAlertReport.java

@@ -17,6 +17,7 @@
 
 package org.apache.hertzbeat.alert.dto;
 
+import java.util.Optional;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
@@ -54,10 +55,18 @@ public void refreshAlertTime() {
         if (StringUtils.isNotBlank(alertDateTime)) {
             Long timeStamp = null;
             if (StringUtils.isNotBlank(dateTimeFormat)) {
-                timeStamp = DateUtil.getTimeStampFromFormat(alertDateTime, dateTimeFormat);
+                Optional<Long> tsf = DateUtil.getTimeStampFromFormat(alertDateTime, dateTimeFormat);
+                boolean present = tsf.isPresent();
+                if (present) {
+                    timeStamp = tsf.get();
+                }
             }
             if (timeStamp == null) {
-                timeStamp = DateUtil.getTimeStampFromSomeFormats(alertDateTime);
+                Optional<Long> tsf = DateUtil.getTimeStampFromSomeFormats(alertDateTime);
+                boolean present = tsf.isPresent();
+                if (present) {
+                    timeStamp = tsf.get();
+                }
             }
             if (timeStamp != null) {
                 setAlertTime(timeStamp);

alerter/src/main/java/org/apache/hertzbeat/alert/dto/TenCloudAlertReport.java

@@ -132,7 +132,9 @@ public Integer getAlertDuration() {
 
     @Override
     public long getAlertTime() {
-        return DateUtil.getTimeStampFromFormat(getFirstOccurTime(), "yyyy-MM-dd HH:mm:ss");
+
+        return DateUtil.getTimeStampFromFormat(getFirstOccurTime(), "yyyy-MM-dd HH:mm:ss")
+                .orElse(0L);
     }
 
     @Override

alerter/src/main/java/org/apache/hertzbeat/alert/util/AlertTemplateUtil.java

@@ -26,7 +26,10 @@
  * Alarm template keyword matching replacement engine tool
  */
 @Slf4j
-public class AlertTemplateUtil {
+public final class AlertTemplateUtil {
+
+    private AlertTemplateUtil() {
+    }
 
     /**
      * Match the variable ${key}

alerter/src/main/java/org/apache/hertzbeat/alert/util/DateUtil.java

@@ -17,49 +17,67 @@
 
 package org.apache.hertzbeat.alert.util;
 
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeFormatterBuilder;
+import java.util.Optional;
 import lombok.extern.slf4j.Slf4j;
 
 /**
  * date time common util
  */
 @Slf4j
-public class DateUtil {
+public final class DateUtil {
+
+    private DateUtil() {
+    }
 
     private static final String[] DATE_FORMATS = {
+            "yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSS'Z'",
             "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
             "yyyy-MM-dd HH:mm:ss"
     };
 
     /**
      * convert date to timestamp
      * @param date date
+     * @return timestamp
      */
-    public static Long getTimeStampFromSomeFormats(String date) {
-        SimpleDateFormat sdf;
+    public static Optional<Long> getTimeStampFromSomeFormats(String date) {
         for (String dateFormat : DATE_FORMATS) {
             try {
-                sdf = new SimpleDateFormat(dateFormat);
-                return sdf.parse(date).getTime();
-            } catch (ParseException e) {
-                log.error(e.getMessage());
+                DateTimeFormatter dateTimeFormatter = new DateTimeFormatterBuilder()
+                        .appendPattern(dateFormat)
+                        // enable string conversion in strict mode.
+                        .parseStrict()
+                        .toFormatter();
+                LocalDateTime time = LocalDateTime.parse(date, dateTimeFormatter);
+                return Optional.of(time.toInstant(ZoneOffset.UTC).toEpochMilli());
+            } catch (Exception e) {
+                log.warn("Error parsing date '{}' with format '{}': {}",
+                        date, dateFormat, e.getMessage());
             }
         }
-        return null;
+
+        log.error("Error parsing date '{}', no corresponding date format", date);
+        return Optional.empty();
     }
 
     /**
      * convert format data to timestamp
      */
-    public static Long getTimeStampFromFormat(String date, String format) {
-        SimpleDateFormat sdf = new SimpleDateFormat(format);
+    public static Optional<Long> getTimeStampFromFormat(String date, String format) {
         try {
-            return sdf.parse(date).getTime();
+            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);
+            LocalDateTime dateTime = LocalDateTime.parse(date, formatter);
+            return Optional.of(dateTime.toInstant(java.time.ZoneOffset.UTC).toEpochMilli());
         } catch (Exception e) {
-            log.error(e.getMessage());
+            log.error("Error parsing date '{}' with format '{}': {}",
+                    date, format, e.getMessage());
         }
-        return null;
+
+        return Optional.empty();
     }
 
 }

alerter/src/test/java/org/apache/hertzbeat/alert/util/DateUtilTest.java

@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hertzbeat.alert.util;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Test case for {@link DateUtil}
+ */
+class DateUtilTest {
+
+    @Test
+    void getTimeStampFromSomeFormats() {
+        String date = "2024-05-13";
+        Optional<Long> actualTimestamp = DateUtil.getTimeStampFromSomeFormats(date);
+        assertFalse(actualTimestamp.isPresent());
+
+        date = "2024-05-13T12:34:56.789Z";
+        actualTimestamp = DateUtil.getTimeStampFromSomeFormats(date);
+        assertTrue(actualTimestamp.isPresent());
+        assertEquals(1715603696789L, actualTimestamp.get());
+
+        date = "2023-02-22T07:27:15.404000000Z";
+        actualTimestamp = DateUtil.getTimeStampFromSomeFormats(date);
+        assertTrue(actualTimestamp.isPresent());
+        assertEquals(1677050835404L, actualTimestamp.get());
+    }
+
+    @Test
+    void getTimeStampFromFormat() {
+        String date = "2024-05-13 10:30:00";
+        String format = "yyyy-MM-dd HH:mm:ss";
+        Optional<Long> actualTimestamp = DateUtil.getTimeStampFromFormat(date, format);
+        assertTrue(actualTimestamp.isPresent());
+        assertEquals(1715596200000L, actualTimestamp.get());
+
+        date = "2024-05-13";
+        format = "yyyy-MM-dd HH:mm:ss.SSS";
+        actualTimestamp = DateUtil.getTimeStampFromFormat(date, format);
+        assertFalse(actualTimestamp.isPresent());
+    }
+}