How to localize the custom headers text in the Flutter Calendar (SfCalendar)

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In the Flutter Calendar, you can localize the custom header by using DateFormat.

Please refer the KB for adding custom headers in the Flutter Calendar.

KB link: https://www.syncfusion.com/kb/10997/how-to-add-custom-header-and-view-header-in-the-flutter-calendar

STEP 1: Initialize the default values for calendar.

final CalendarController _controller=CalendarController();
String? _headerText='';
String? date;
double? _width=0.0, cellWidth=0.0;
String _string='';

STEP 2: Using the onViewChanged callback, update the header with specified locale.

child: SfCalendar(
    headerHeight: 0,
    controller: _controller,
    view: CalendarView.month,
    onViewChanged: (ViewChangedDetails viewChangedDetails) {
      _headerText = DateFormat('MMMM yyyy', 'fr')
          .format(viewChangedDetails
          .visibleDates[viewChangedDetails.visibleDates
          .length ~/ 2])
          .toString();
      _string = _headerText![0].toUpperCase() +
          _headerText!.substring(1);
      SchedulerBinding.instance!.addPostFrameCallback((
          duration) {
        setState(() {});
      });
    }
))

View sample in GitHub

Flutter Calendar custom header localization

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How to localize the custom headers text in the Flutter Calendar (SfCalendar)

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