Fix chrono::DateTime<Utc> tests

`test_date_time_params` and `test_with_special_date_time_params` could fail when run with a non-UTC system time zone.

In Postgres, if no time zone is stated in the input string, then it is assumed to be in system time.
This means that in these tests, a correctly parsed `DateTime<Utc>` could be compared to an incorrectly offset time.

The offset component is now included in the test strings of these tests. This component is already present in the test strings for `time::OffsetDateTime`.

tokio-postgres/tests/test/types/chrono_04.rs

@@ -1,4 +1,4 @@
-use chrono_04::{DateTime, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
+use chrono_04::{DateTime, NaiveDate, NaiveDateTime, NaiveTime, Utc};
 use std::fmt;
 use tokio_postgres::types::{Date, FromSqlOwned, Timestamp};
 use tokio_postgres::Client;
@@ -53,18 +53,20 @@ async fn test_with_special_naive_date_time_params() {
 async fn test_date_time_params() {
     fn make_check(time: &str) -> (Option<DateTime<Utc>>, &str) {
         (
-            Some(Utc.from_utc_datetime(
-                &NaiveDateTime::parse_from_str(time, "'%Y-%m-%d %H:%M:%S.%f'").unwrap(),
-            )),
+            Some(
+                DateTime::parse_from_str(time, "'%Y-%m-%d %H:%M:%S.%f%#z'")
+                    .unwrap()
+                    .to_utc(),
+            ),
             time,
         )
     }
     test_type(
         "TIMESTAMP WITH TIME ZONE",
         &[
-            make_check("'1970-01-01 00:00:00.010000000'"),
-            make_check("'1965-09-25 11:19:33.100314000'"),
-            make_check("'2010-02-09 23:11:45.120200000'"),
+            make_check("'1970-01-01 00:00:00.010000000Z'"),
+            make_check("'1965-09-25 11:19:33.100314000Z'"),
+            make_check("'2010-02-09 23:11:45.120200000Z'"),
             (None, "NULL"),
         ],
     )
@@ -75,18 +77,20 @@ async fn test_date_time_params() {
 async fn test_with_special_date_time_params() {
     fn make_check(time: &str) -> (Timestamp<DateTime<Utc>>, &str) {
         (
-            Timestamp::Value(Utc.from_utc_datetime(
-                &NaiveDateTime::parse_from_str(time, "'%Y-%m-%d %H:%M:%S.%f'").unwrap(),
-            )),
+            Timestamp::Value(
+                DateTime::parse_from_str(time, "'%Y-%m-%d %H:%M:%S.%f%#z'")
+                    .unwrap()
+                    .to_utc(),
+            ),
             time,
         )
     }
     test_type(
         "TIMESTAMP WITH TIME ZONE",
         &[
-            make_check("'1970-01-01 00:00:00.010000000'"),
-            make_check("'1965-09-25 11:19:33.100314000'"),
-            make_check("'2010-02-09 23:11:45.120200000'"),
+            make_check("'1970-01-01 00:00:00.010000000Z'"),
+            make_check("'1965-09-25 11:19:33.100314000Z'"),
+            make_check("'2010-02-09 23:11:45.120200000Z'"),
             (Timestamp::PosInfinity, "'infinity'"),
             (Timestamp::NegInfinity, "'-infinity'"),
         ],