diff --git a/data-prepper-plugins/date-processor/src/main/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessor.java b/data-prepper-plugins/date-processor/src/main/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessor.java
index 328f8294bc..a2260a8694 100644
--- a/data-prepper-plugins/date-processor/src/main/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessor.java
+++ b/data-prepper-plugins/date-processor/src/main/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessor.java
@@ -131,10 +131,12 @@ private DateTimeFormatter getSourceFormatter(final String pattern) {
                 .appendPattern(pattern)
                 .parseDefaulting(ChronoField.MONTH_OF_YEAR, localDateForDefaultValues.getMonthValue())
                 .parseDefaulting(ChronoField.DAY_OF_MONTH, localDateForDefaultValues.getDayOfMonth())
-                .parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
                 .parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
                 .parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0);
 
+        if(!pattern.contains("a") && !pattern.contains("k"))
+            dateTimeFormatterBuilder.parseDefaulting(ChronoField.HOUR_OF_DAY, 0);
+
         if (!(pattern.contains("y") || pattern.contains("u")))
             dateTimeFormatterBuilder.parseDefaulting(ChronoField.YEAR_OF_ERA, localDateForDefaultValues.getYear());
 
diff --git a/data-prepper-plugins/date-processor/src/test/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessorTests.java b/data-prepper-plugins/date-processor/src/test/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessorTests.java
index 91299dc4b3..27a9af6a60 100644
--- a/data-prepper-plugins/date-processor/src/test/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessorTests.java
+++ b/data-prepper-plugins/date-processor/src/test/java/org/opensearch/dataprepper/plugins/processor/date/DateProcessorTests.java
@@ -539,6 +539,36 @@ void match_without_year_test(String pattern) {
         verify(dateProcessingMatchSuccessCounter, times(1)).increment();
     }
 
+    @ParameterizedTest
+    @ValueSource(strings = {"hh:mm:ss a", "KK:mm:ss a", "kk:mm:ss", "HH:mm:ss"})
+    void match_with_different_hours_formats(String pattern) {
+        when(mockDateMatch.getKey()).thenReturn("logDate");
+        when(mockDateMatch.getPatterns()).thenReturn(Collections.singletonList(pattern));
+
+        List<DateProcessorConfig.DateMatch> dateMatches = Collections.singletonList(mockDateMatch);
+        when(mockDateProcessorConfig.getMatch()).thenReturn(dateMatches);
+        when(mockDateProcessorConfig.getSourceZoneId()).thenReturn(ZoneId.systemDefault());
+        when(mockDateProcessorConfig.getDestinationZoneId()).thenReturn(ZoneId.systemDefault());
+        when(mockDateProcessorConfig.getSourceLocale()).thenReturn(Locale.ROOT);
+        when(mockDateProcessorConfig.getToOriginationMetadata()).thenReturn(true);
+
+        dateProcessor = createObjectUnderTest();
+
+        Map<String, Object> testData = getTestData();
+        String formattedExpectedTime = expectedDateTime.format(DateTimeFormatter.ofPattern(pattern));
+        testData.put("logDate", formattedExpectedTime);
+
+        final Record<Event> record = buildRecordWithEvent(testData);
+        final List<Record<Event>> processedRecords = (List<Record<Event>>) dateProcessor.doExecute(Collections.singletonList(record));
+
+        Event event = processedRecords.get(0).getData();
+        Assertions.assertNotNull(event.getMetadata().getExternalOriginationTime());
+        Assertions.assertNotNull(event.getEventHandle().getExternalOriginationTime());
+        ZonedDateTime expectedZonedDatetime = expectedDateTime.atZone(mockDateProcessorConfig.getSourceZoneId()).truncatedTo(ChronoUnit.SECONDS);
+        Assertions.assertEquals(expectedZonedDatetime, event.getMetadata().getExternalOriginationTime().atZone(mockDateProcessorConfig.getSourceZoneId()));
+        verify(dateProcessingMatchSuccessCounter, times(1)).increment();
+    }
+
     @Test
     void date_processor_catches_exceptions_instead_of_throwing() {
         final String dateWhen = UUID.randomUUID().toString();