diff --git a/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/utils/time/DateTimeFormatterTimestampConverter.java b/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/utils/time/DateTimeFormatterTimestampConverter.java
index e991fdd1b5e..556c2f37b48 100644
--- a/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/utils/time/DateTimeFormatterTimestampConverter.java
+++ b/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/utils/time/DateTimeFormatterTimestampConverter.java
@@ -5,6 +5,8 @@
  */
 package org.elasticsearch.xpack.core.ml.utils.time;
 
+import org.elasticsearch.cli.SuppressForbidden;
+
 import java.time.DateTimeException;
 import java.time.Instant;
 import java.time.LocalDate;
@@ -84,6 +86,11 @@ public class DateTimeFormatterTimestampConverter implements TimestampConverter {
         if (hasTimeZone) {
             return Instant.from(parsed);
         }
+        return toInstantUnsafelyIgnoringAmbiguity(parsed);
+    }
+
+    @SuppressForbidden(reason = "TODO https://github.com/elastic/x-pack-elasticsearch/issues/3810")
+    private Instant toInstantUnsafelyIgnoringAmbiguity(TemporalAccessor parsed) {
         return LocalDateTime.from(parsed).atZone(defaultZoneId).toInstant();
     }
 }