[FLINK-38308] Reduce logging of date parse errors in DateTimeUtils

Author: snuyanzin

flink-table/flink-table-common/src/main/java/org/apache/flink/table/utils/DateTimeUtils.java

@@ -1481,7 +1481,9 @@ public static String formatUnixTimestamp(long unixtime, String format, TimeZone
         try {
             return formatter.format(date);
         } catch (Exception e) {
-            LOG.error("Exception when formatting.", e);
+            LOG.debug(
+                    String.format(
+                            "Exception when formatting date '%s' to format '%s'.", date, format));
             return null;
         }
     }