diff --git a/quickwit/quickwit-query/src/elastic_query_dsl/range_query.rs b/quickwit/quickwit-query/src/elastic_query_dsl/range_query.rs
index 846d4a428cf..ad51e3d5d52 100644
--- a/quickwit/quickwit-query/src/elastic_query_dsl/range_query.rs
+++ b/quickwit/quickwit-query/src/elastic_query_dsl/range_query.rs
@@ -107,3 +107,40 @@ fn parse_and_convert(literal: JsonLiteral, parser: &StrptimeParser) -> anyhow::R
         Ok(literal)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::str::FromStr;
+
+    use quickwit_datetime::StrptimeParser;
+
+    use crate::elastic_query_dsl::range_query::parse_and_convert;
+    use crate::JsonLiteral;
+
+    #[test]
+    fn test_parse_and_convert() {
+        let parser = StrptimeParser::from_str("%Y-%m-%d %H:%M:%S").unwrap();
+
+        // valid datetime
+        let input = JsonLiteral::String("2022-12-30 05:45:00".to_string());
+        let result = parse_and_convert(input, &parser)?;
+        assert_eq!(
+            result,
+            JsonLiteral::String("2022-12-30 5:45:00.0 +00:00:00".to_string())
+        );
+
+        // invalid datetime
+        let input = JsonLiteral::String("invalid datetime".to_string());
+        let result = parse_and_convert(input, &parser);
+        assert!(result.is_err());
+        assert!(result
+            .unwrap_err()
+            .to_string()
+            .contains("Failed to parse date time"));
+
+        // non_string(number) input
+        let input = JsonLiteral::Number(27.into());
+        let result = parse_and_convert(input.clone(), &parser)?;
+        assert_eq!(result, input);
+    }
+}