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lib/widgets/shared/adaptive_date_picker.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+Future<DateTime?> showAdaptiveDatePicker(
+  BuildContext context, {
+  DateTime? initialDateTime,
+}) async {
+  final ThemeData theme = Theme.of(context);
+  if (theme.platform == TargetPlatform.iOS) {
+    return _buildCupertinoDatePicker(
+      context,
+      initialDateTime: initialDateTime,
+    );
+  } else {
+    return _buildMaterialDatePicker(
+      context,
+      initialDateTime: initialDateTime,
+    );
+  }
+}
+
+Future<DateTime?> _buildCupertinoDatePicker(
+  BuildContext context, {
+  DateTime? initialDateTime,
+}) async {
+  DateTime? newDate;
+  showModalBottomSheet(
+    context: context,
+    builder: (BuildContext builder) {
+      return Container(
+        height: MediaQuery.of(context).copyWith().size.height / 3,
+        color: Theme.of(context).colorScheme.surface,
+        child: CupertinoDatePicker(
+          onDateTimeChanged: (value) {
+            newDate = value;
+          },
+          initialDateTime: initialDateTime,
+          dateOrder: DatePickerDateOrder.ymd,
+        ),
+      );
+    },
+  );
+  return newDate;
+}
+
+Future<DateTime?> _buildMaterialDatePicker(
+  BuildContext context, {
+  DateTime? initialDateTime,
+}) async {
+  final DateTime? picked = await showDatePicker(
+    context: context,
+    initialDate: initialDateTime ?? DateTime.now(),
+    firstDate: DateTime(2000),
+    lastDate: DateTime(2025),
+  );
+  return picked;
+}