[syncfusion_flutter_datepicker] can I custom header text format?

[hakama99]

Use case

_getMonthHeaderText

final String monthTextFormat =
        monthFormat == null || monthFormat.isEmpty
            ? enableMultiView &&
                    navigationDirection ==
                        DateRangePickerNavigationDirection.vertical
                ? 'MMM'
                : 'MMMM'
            : monthFormat;
    String text;
    dynamic middleDate = dates[middleIndex];
    if (isHijri) {
      text =
          // ignore: lines_longer_than_80_chars
          '${DateRangePickerHelper.getHijriMonthText(middleDate, localizations, monthTextFormat)} ${middleDate.year}';
    } else {
      text =
          '${DateFormat(monthTextFormat, locale.toString()).format(middleDate)}'
          ' ${middleDate.year}';
    }

Proposal

I need format like this
'${middleDate.year} ${DateRangePickerHelper.getHijriMonthText(middleDate, localizations, monthTextFormat)}'

[Mugunthan-Ramalingam]

Hi Hakama,

The Flutter SfDateRangePicker provides a monthFormat property, which allows customizing only the month text displayed in the built‑in header (for example, switching between formats like "MMM" or "MMMM"). However, the control does not provide to change the overall header layout or reorder the text. This means formats like “Year Month” cannot be achieved using the default header.

However, we prepared a workaround by hiding the built‑in header and adding a custom header above the picker. This custom header updates its text using the onViewChanged callback and displays the format “Year Month”. For the SfHijriDateRangePicker, the API does not return the month name, so the sample includes a small list of Hijri month names to generate the correct header text.

Since the header is custom and not part of the SfDateRangePicker UI, it will not automatically update based on localization. If the app’s language changes, the custom header text must be updated manually, as localization does not apply to custom elements.

We have shared the KB documentation for your reference.
KB link: How to customize the header in the Flutter multi date range picker (SfDateRangePicker)?

We have shared a sample for your reference, which you can further customize based on your specific requirements.

If you have any further queries, please get back to us. We are always happy to assist you.

Sample: gh_2495.zip

Regards,
Mugunthan.