Question 263866 in Flutter Question posted in
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Flutter Error: The argument type 'DateTime?' can't be assigned to the parameter type 'DateTime'

Error: The argument type ‘DateTime?’ can’t be assigned to the parameter type ‘DateTime’.

  @override
  Widget build(BuildContext context) {
    final formatter = LastUpdatedDateFormatter(
      lastUpdated: _endpointsData != null ? _endpointsData.values[Endpoint.cases]!.date : null,
    );
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Solved: I removed nulls in my statement then casted as DateTime.

    lastUpdated: _endpointsData.values[Endpoint.cases]?.date as DateTime,


  2. 0

    ? next to the type declaration means that a variable is nullable, meaning it can accept a null value

    For example: String? a = null is valid, while String bar = null is not a valid statement.

    In your expression lastUpdated: _endpointsData != null ? _endpointsData.values[Endpoint.cases]!.date : null, there is a possibility for the lastUpdated parameter to receive a null value, which it does not expect or accept. It needs to receive a DateTime object. Consider using a default value, for example – DateTime.now() instead of null:

    @override
  Widget build(BuildContext context) {
    final formatter = LastUpdatedDateFormatter(
      lastUpdated: _endpointsData != null ? _endpointsData.values[Endpoint.cases]!.date : DateTime.now(),
    );

    For more info, refer to Dart docs at https://dart.dev/null-safety

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