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[Flutter/Dart] "Invalid date format" in DateTime parse


Situation


(It's a mistake to say from the conclusion ...)

I convert DateTime type variable to String with dart and save it in shared preference. If you try to convert to DateTime type with parse method when reading from shared preference again, the above exception will occur.

class DaTa{

  DateTime date;
  var _formatter = new DateFormat('yyyy/MM/dd HH:mm');

  //convert to json
  Map toJson() {
    //DateTime → String
    String _formatted = _formatter.format(setting_changed_date); 
    return {
        'date': _formatted,
    };
  }
  
  //read from json
  Data.fromJson(Map json){
    //String → DateTime
    date =DateTime.parse(json['date']);  //exception here
  }
}


Cause and Solution


You must use _formatter.parse () instead of DateTime.parse (). Since the format does not match, it becomes 'Invalid data format'.

 Data.fromJson(Map json){
    //String → DateTime
    date = _formatter.parse(json['date']); //edit here 
  }

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