Skip some broken datetime tests on the web

drift/test/database/expressions/datetime_expression_test.dart

@@ -72,10 +72,18 @@ void main() {
         if (useText) {
           expect(
             expr,
-            generatesWithOptions(
-              "datetime(datetime(CURRENT_TIMESTAMP, '259200.0 seconds'), "
-              "'-5.0 seconds')",
-              options: options,
+            anyOf(
+              generatesWithOptions(
+                "datetime(datetime(CURRENT_TIMESTAMP, '259200.0 seconds'), "
+                "'-5.0 seconds')",
+                options: options,
+              ),
+              // emits a whole number on the web which is fine too
+              generatesWithOptions(
+                "datetime(datetime(CURRENT_TIMESTAMP, '259200 seconds'), "
+                "'-5 seconds')",
+                options: options,
+              ),
             ),
           );
         } else {

drift/test/database/expressions/expressions_integration_test.dart

@@ -85,7 +85,8 @@ void _testWith(TodoDb Function() openDb, {bool dateTimeAsText = false}) {
           completion('2020-09-06'));
       expect(eval(expr.time), completion('23:55:00'));
       expect(eval(expr.datetime), completion('2020-09-03 23:55:00'));
-      expect(eval(expr.julianday), completion(2459096.496527778));
+      expect(
+          eval(expr.julianday), completion(closeTo(2459096.496527778, 0.0001)));
       expect(eval(expr.unixepoch), completion(1599177300));
       expect(eval(expr.strftime('%Y-%m-%d %H:%M:%S')),
           completion('2020-09-03 23:55:00'));
@@ -143,8 +144,12 @@ void _testWith(TodoDb Function() openDb, {bool dateTimeAsText = false}) {
         eval(expr.modify(DateTimeModifier.weekday(DateTime.saturday))),
         completion(result(DateTime.utc(2022, 07, 09))),
       );
+    });
+
+    if (!dateTimeAsText) {
+      test('modifiers utc/local', () {
+        final expr = Variable.withDateTime(DateTime.utc(2022, 07, 05));
 
-      if (!dateTimeAsText) {
         // drift interprets date time values as timestamps, so going to UTC
         // means subtracting the UTC offset in SQL. Interpreting that timestamp
         // in dart will effectively add it back, so we have the same value bit
@@ -157,8 +162,10 @@ void _testWith(TodoDb Function() openDb, {bool dateTimeAsText = false}) {
             eval(Variable.withDateTime(DateTime(2022, 07, 05))
                 .modify(const DateTimeModifier.localTime())),
             completion(DateTime.utc(2022, 07, 05).toLocal()));
-      }
-    });
+      }, onPlatform: const {
+        'browser': Skip('TODO: UTC offsets are unknown in WebAssembly module')
+      });
+    }
 
     test('aggregates', () async {
       final firstTime = DateTime(2021, 5, 7);

drift/test/database/types/datetime_test.dart

@@ -84,9 +84,15 @@ void main() {
           generatesWithOptions("'2022-07-21T22:53:12.888999Z'",
               options: options),
         );
+      }, onPlatform: const {
+        'browser': Skip('Assumes DateTimes using int64 timestamps'),
+      });
 
+      test('as text throws if UTC offset is not in minutes', () {
         // Writing date times with an UTC offset that isn't a whole minute
         // is not supported and should throw.
+        const options = DriftDatabaseOptions(storeDateTimeAsText: true);
+
         expect(() {
           final context = stubContext(options: options);
           Variable(_MockDateTime(local, const Duration(seconds: 30)))