diff --git a/src/datetime/tests.rs b/src/datetime/tests.rs
index a9de65353b..8de083fa11 100644
--- a/src/datetime/tests.rs
+++ b/src/datetime/tests.rs
@@ -312,6 +312,7 @@ fn ymdhms_nano(
 }
 
 // local helper function to easily create a DateTime<Utc>
+#[cfg(any(feature = "alloc", feature = "std"))]
 fn ymdhms_utc(year: i32, month: u32, day: u32, hour: u32, min: u32, sec: u32) -> DateTime<Utc> {
     Utc.with_ymd_and_hms(year, month, day, hour, min, sec).unwrap()
 }
@@ -958,39 +959,37 @@ fn test_utc_datetime_from_str() {
 }
 
 #[test]
-fn test_utc_datetime_from_str_with_spaces() {
-    let dt = ymdhms_utc(2013, 8, 9, 23, 54, 35);
+fn test_datetime_parse_from_str_with_spaces() {
+    let parse_from_str = NaiveDateTime::parse_from_str;
+    let dt = NaiveDate::from_ymd_opt(2013, 8, 9).unwrap().and_hms_opt(23, 54, 35).unwrap();
     // with varying spaces - should succeed
-    assert_eq!(Utc.datetime_from_str(" Aug 09 2013 23:54:35", " %b %d %Y %H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug 09 2013 23:54:35 ", "%b %d %Y %H:%M:%S "), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str(" Aug 09 2013  23:54:35 ", " %b %d %Y  %H:%M:%S "), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("  Aug 09 2013 23:54:35", "  %b %d %Y %H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("   Aug 09 2013 23:54:35", "   %b %d %Y %H:%M:%S"), Ok(dt),);
-    assert_eq!(
-        Utc.datetime_from_str("\n\tAug 09 2013 23:54:35  ", "\n\t%b %d %Y %H:%M:%S  "),
-        Ok(dt),
-    );
-    assert_eq!(Utc.datetime_from_str("\tAug 09 2013 23:54:35\t", "\t%b %d %Y %H:%M:%S\t"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug  09 2013 23:54:35", "%b  %d %Y %H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug    09 2013 23:54:35", "%b    %d %Y %H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug  09 2013\t23:54:35", "%b  %d %Y\t%H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug  09 2013\t\t23:54:35", "%b  %d %Y\t\t%H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug 09 2013 23:54:35 ", "%b %d %Y %H:%M:%S\n"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug 09 2013 23:54:35", "%b %d %Y\t%H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug 09 2013 23:54:35", "%b %d %Y %H:%M:%S "), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug 09 2013 23:54:35", " %b %d %Y %H:%M:%S"), Ok(dt),);
-    assert_eq!(Utc.datetime_from_str("Aug 09 2013 23:54:35", "%b %d %Y %H:%M:%S\n"), Ok(dt),);
+    assert_eq!(parse_from_str(" Aug 09 2013 23:54:35", " %b %d %Y %H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug 09 2013 23:54:35 ", "%b %d %Y %H:%M:%S "), Ok(dt));
+    assert_eq!(parse_from_str(" Aug 09 2013  23:54:35 ", " %b %d %Y  %H:%M:%S "), Ok(dt));
+    assert_eq!(parse_from_str("  Aug 09 2013 23:54:35", "  %b %d %Y %H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("   Aug 09 2013 23:54:35", "   %b %d %Y %H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("\n\tAug 09 2013 23:54:35  ", "\n\t%b %d %Y %H:%M:%S  "), Ok(dt));
+    assert_eq!(parse_from_str("\tAug 09 2013 23:54:35\t", "\t%b %d %Y %H:%M:%S\t"), Ok(dt));
+    assert_eq!(parse_from_str("Aug  09 2013 23:54:35", "%b  %d %Y %H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug    09 2013 23:54:35", "%b    %d %Y %H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug  09 2013\t23:54:35", "%b  %d %Y\t%H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug  09 2013\t\t23:54:35", "%b  %d %Y\t\t%H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug 09 2013 23:54:35 ", "%b %d %Y %H:%M:%S\n"), Ok(dt));
+    assert_eq!(parse_from_str("Aug 09 2013 23:54:35", "%b %d %Y\t%H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug 09 2013 23:54:35", "%b %d %Y %H:%M:%S "), Ok(dt));
+    assert_eq!(parse_from_str("Aug 09 2013 23:54:35", " %b %d %Y %H:%M:%S"), Ok(dt));
+    assert_eq!(parse_from_str("Aug 09 2013 23:54:35", "%b %d %Y %H:%M:%S\n"), Ok(dt));
     // with varying spaces - should fail
     // leading space in data
-    assert!(Utc.datetime_from_str(" Aug 09 2013 23:54:35", "%b %d %Y %H:%M:%S").is_err());
+    assert!(parse_from_str(" Aug 09 2013 23:54:35", "%b %d %Y %H:%M:%S").is_err());
     // trailing space in data
-    assert!(Utc.datetime_from_str("Aug 09 2013 23:54:35 ", "%b %d %Y %H:%M:%S").is_err());
+    assert!(parse_from_str("Aug 09 2013 23:54:35 ", "%b %d %Y %H:%M:%S").is_err());
     // trailing tab in data
-    assert!(Utc.datetime_from_str("Aug 09 2013 23:54:35\t", "%b %d %Y %H:%M:%S").is_err());
+    assert!(parse_from_str("Aug 09 2013 23:54:35\t", "%b %d %Y %H:%M:%S").is_err());
     // mismatched newlines
-    assert!(Utc.datetime_from_str("\nAug 09 2013 23:54:35", "%b %d %Y %H:%M:%S\n").is_err());
+    assert!(parse_from_str("\nAug 09 2013 23:54:35", "%b %d %Y %H:%M:%S\n").is_err());
     // trailing literal in data
-    assert!(Utc.datetime_from_str("Aug 09 2013 23:54:35 !!!", "%b %d %Y %H:%M:%S ").is_err());
+    assert!(parse_from_str("Aug 09 2013 23:54:35 !!!", "%b %d %Y %H:%M:%S ").is_err());
 }
 
 #[test]