diff --git a/QueryKit.IntegrationTests/Tests/FilterParsingRegressionTests.cs b/QueryKit.IntegrationTests/Tests/FilterParsingRegressionTests.cs
index 211c198..a87ce98 100644
--- a/QueryKit.IntegrationTests/Tests/FilterParsingRegressionTests.cs
+++ b/QueryKit.IntegrationTests/Tests/FilterParsingRegressionTests.cs
@@ -145,7 +145,6 @@ public async Task date_time_offset_value_with_offset_matches_same_instant(string
 
     [Theory]
     [InlineData("SpecificDateTime == 2024-01-15T08:00:00.500Z", true)]
-    [InlineData("SpecificDateTime == 2024-01-15T08:00:00Z.5", true)]
     [InlineData("SpecificDate == 2024-01-15T10:00:00.5+02:00", true)]
     [InlineData("Time == 08:30:00.5", true)]
     [InlineData("Time == \"08:30:00.500\"", true)]
diff --git a/QueryKit.UnitTests/FilterParsingRegressionTests.cs b/QueryKit.UnitTests/FilterParsingRegressionTests.cs
index 74a38a0..3892da6 100644
--- a/QueryKit.UnitTests/FilterParsingRegressionTests.cs
+++ b/QueryKit.UnitTests/FilterParsingRegressionTests.cs
@@ -150,8 +150,6 @@ public void enum_list_value_is_split_into_items()
     [InlineData("SpecificDateTime ^^ [2024-01-15T08:00:00.5Z]")]
     [InlineData("SpecificDate == 2024-01-15T10:00:00.5+02:00")]
     [InlineData("SpecificDate == 2024-01-15T08:00:00.5000000Z")]
-    [InlineData("SpecificDateTime == 2024-01-15T08:00:00Z.5")]
-    [InlineData("SpecificDate == 2024-01-15T10:00:00+02:00.500")]
     [InlineData("Time == 08:30:00.5")]
     [InlineData("Time == \"08:30:00.500\"")]
     [InlineData("Time == \"08:30:00.5\"")]
@@ -164,6 +162,16 @@ public void fractional_seconds_are_kept(string input)
         result.Select(x => x.Title).Should().Equal("match");
     }
 
+    [Theory]
+    [InlineData("SpecificDateTime == 2024-01-15T08:00:00Z.5")]
+    [InlineData("SpecificDate == 2024-01-15T10:00:00+02:00.500")]
+    public void zone_before_the_fraction_throws(string input)
+    {
+        var act = () => FilterParser.ParseFilter<TestingPerson>(input);
+
+        act.Should().Throw<ParsingException>();
+    }
+
     private static TestingPerson[] FractionalSecondPeople() => new[]
     {
         new TestingPerson
diff --git a/QueryKit/FilterParser.cs b/QueryKit/FilterParser.cs
index 551d5ff..1b5daad 100644
--- a/QueryKit/FilterParser.cs
+++ b/QueryKit/FilterParser.cs
@@ -297,14 +297,12 @@ private static readonly Parser<string> DoubleQuoteParser
     private static readonly Parser<string> DateTimeTimeParser = Parse.Regex(@"T\d{2}:\d{2}:\d{2}").Text().Optional().Select(x => x.GetOrElse(""));
     private static readonly Parser<string> DateTimeMicrosParser = Parse.Regex(@"\.\d{1,7}").Text().Optional().Select(x => x.GetOrElse(""));
     private static readonly Parser<string> DateTimeZoneParser = Parse.Regex(@"Z|[+-]\d{2}(:\d{2})?").Text().Optional().Select(x => x.GetOrElse(""));
-    // v1.14.2 read the zone before the fraction, so 2022-07-01T00:00:02Z.5 is a valid value. A zone after the fraction is also valid.
     private static readonly Parser<string> DateTimeFormatParser =
         from dateFormat in Parse.Regex(@"\d{4}-\d{2}-\d{2}").Text()
         from timeFormat in DateTimeTimeParser
-        from zoneBeforeMicros in DateTimeZoneParser
         from micros in DateTimeMicrosParser
-        from zoneAfterMicros in zoneBeforeMicros == "" ? DateTimeZoneParser : Parse.Return("")
-        select dateFormat + timeFormat + micros + zoneBeforeMicros + zoneAfterMicros;
+        from timeZone in DateTimeZoneParser
+        select dateFormat + timeFormat + micros + timeZone;
 
     // A number always uses the '.' decimal point, so a filter has the same meaning in every culture.
     private static readonly Parser<string> NumberParser =
diff --git a/README.md b/README.md
index 7299a7f..8edcf02 100644
--- a/README.md
+++ b/README.md
@@ -262,6 +262,7 @@ Property list grouping is particularly useful for:
     * `var filterInput = """Time == "12:30:00" """;`
     * `var filterInput = """Time == "12:30:00.678722" """;`
     * A time fraction keeps every digit. For example, `"12:30:00.5"` is 12:30:00 and 500 milliseconds.
+  * In a date and time value, write the zone after the fraction: `2022-07-01T00:00:03.5Z`. An unquoted value with the zone before the fraction (`2022-07-01T00:00:03Z.5`) throws a `ParsingException`.
 
 * `bool` properties need to use `== true`, `== false`, or the same using the `!=` operator. they can not be standalone properies: