[FormBuilderDateTimePicker]: Got problem if initialDate is null and lastDate is years ago.

[devon]

Is there an existing issue for this?

• I have searched the existing issues

Package/Plugin version

9.2.1

Platforms

• Android
• iOS
• Linux
• MacOS
• Web
• Windows

Flutter doctor

Flutter doctor

Flutter (Channel stable, 3.16.9, on
    macOS 14.2.1 23C71 darwin-arm64, locale
    en-CA)
[✓] Xcode - develop for iOS and macOS (Xcode
    15.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.1)

Minimal code example

Code sample

FormBuilderDateTimePicker(
  name: 'birthday',
  initialValue: null,
  firstDate: DateTime(1923, 1, 1),
  lastDate: DateTime(2006, 12, 31),
),

Current Behavior

Got error:

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: 'package:flutter/src/material/date_picker.dart': Failed assertion: line 201 pos 5: 'initialDate == null || !initialDate.isAfter(lastDate)': initialDate 2024-02-13 00:00:00.000 must be on or before lastDate 2006-12-31 00:00:00.000.

Expected Behavior

The code should work for a null initialDate.

Steps To Reproduce

Add the form:

FormBuilderDateTimePicker(
  name: 'birthday',
  initialValue: null,
  firstDate: DateTime(1923, 1, 1),
  lastDate: DateTime(2006, 12, 31),
),

And click the field to select a date.

Aditional information

In _showDatePicker, if there is no initialDate, it will set to DateTime.now():

  Future<DateTime?> _showDatePicker(
      BuildContext context, DateTime? currentValue) {
    return showDatePicker(
      context: context,
      selectableDayPredicate: widget.selectableDayPredicate,
      initialDatePickerMode: widget.initialDatePickerMode,
      initialDate: currentValue ?? widget.initialDate ?? DateTime.now(),
     ....

So, it can't pass the assert:

assert(
    initialDate == null || !initialDate.isAfter(lastDate),
    'initialDate $initialDate must be on or before lastDate $lastDate.',
  );

[deandreamatias]

Hi!
I think that here need to improve the assert logic.
If you want, open a PR to solve this. Thanks!

[rsyd29]

same problem, i have error when initialValue is null on FormBuilderDateTimePicker.