Question 78032 in Flutter Question posted in
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Invalid date format for validation flutter

I have a form, the date picker is supposed to validate and check whether the end date is later than the start date. But my coding got error which says

Invalid date format
09/01/2023`

Here is my validation code:

TextEditingController _sDate = TextEditingController();
TextEditingController _eDate = TextEditingController();
String? endDateValidator(value) {
DateTime eDate = DateTime.parse(_eDate.text);
DateTime sDate = DateTime.parse(_sDate.text);
eDate = DateFormat("yyyy-MM-dd").format(eDate);
if (_sDate != null && _eDate == null) {
     return "select Both data";
}
if (_eDate == null) return "select end date";
if (_eDate != null) {
    if(eDate.isBefore(sDate))
         return "End date must be after start date";
    }
    return null;}

How do I fix this?

Tags:

2

Answers


  1. 0

    Your date format is not regular(yyyy-MM-dd) format, you need to use custom format to format it, so instead of this:

    DateTime eDate = DateTime.parse(_eDate.text);
DateTime sDate = DateTime.parse(_sDate.text);
eDate = DateFormat("yyyy-MM-dd").format(eDate);

    You can use intl package and do this::

    DateTime eDate = DateFormat("dd/MM/yyyy").parse(_eDate.text);

    also in line four of your code, format(eDate) return you a string, you can’t pass it to eDate, because it is DateTime. Also you don’t need this line at all.

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  2. 0

    There are two methods of formatting dates if we are working in Flutter:

    1.- Add the intl package (https://pub.dev/packages/intl) and you can access to this functions:

    DateTime now = DateTime.now();
String formattedDate = DateFormat.yMMMEd().format(now);
print(formattedDate);

Output:
Tue, Jan 25, 2022

    2.- Using Custom Pattern

    DateTime now = DateTime.now();
formattedDate = DateFormat('EEEE, MMM d, yyyy').format(now);
print(formattedDate);
Output:
Tuesday, Jan 25, 2022

    For more information:
    https://api.flutter.dev/flutter/intl/DateFormat-class.html

    I hope it was useful for you.

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