truncate seconds in toZoneOffset for DB compatibility

Author: Lexert19

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/DateTimeUtils.java

@@ -821,6 +821,7 @@ public static ZonedDateTime convertToZonedDateTime(long timestamp, ZoneId zoneId
     return ZonedDateTime.ofInstant(Instant.ofEpochMilli(timestamp), zoneId);
   }
 
+  /** Converts string to ZoneOffset. Truncates seconds for HH:mm database compatibility. */
   public static ZoneOffset toZoneOffset(String str, ZoneId zoneId) {
     if (str.endsWith("Z")) {
       return ZoneOffset.UTC;
@@ -834,7 +835,8 @@ public static ZoneOffset toZoneOffset(String str, ZoneId zoneId) {
     long millis = convertDatetimeStrToLong(str, ZoneOffset.UTC, 0, "ms");
     LocalDateTime localDateTime =
         LocalDateTime.ofInstant(Instant.ofEpochMilli(millis), ZoneOffset.UTC);
-    return zoneId.getRules().getOffset(localDateTime);
+    ZoneOffset offset = zoneId.getRules().getOffset(localDateTime);
+    return ZoneOffset.ofTotalSeconds((offset.getTotalSeconds() / 60) * 60);
   }
 
   public static ZonedDateTime convertMillsecondToZonedDateTime(long millisecond) {

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/utils/DateTimeUtilsTest.java

@@ -417,4 +417,18 @@ public void testToZoneOffsetWithBrokenDate() {
               DateTimeUtils.toZoneOffset("2024-12-31 10", zoneId);
             });
   }
+
+  @Test
+  public void testToZoneOffsetHistoricalLMT() {
+    ZoneId zoneId = ZoneId.of("Europe/Warsaw");
+    ZoneOffset offset = DateTimeUtils.toZoneOffset("0001-01-01 00:00:00", zoneId);
+    Assert.assertEquals(ZoneOffset.ofHoursMinutes(1, 24), offset);
+
+    ZoneId shanghaiId = ZoneId.of("Asia/Shanghai");
+    ZoneOffset shanghaiOffset = DateTimeUtils.toZoneOffset("0001-01-01 00:00:00", shanghaiId);
+    Assert.assertEquals(ZoneOffset.ofHoursMinutes(8, 5), shanghaiOffset);
+
+    ZoneId utcId = ZoneId.of("UTC");
+    Assert.assertEquals(ZoneOffset.UTC, DateTimeUtils.toZoneOffset("0001-01-01 00:00:00", utcId));
+  }
 }