Allow custom date formats for the showDatePicker input mode

Use case

I am trying to get the text-based date input in the showDatePicker dialog to be based on specific date format (in my case DD/MM/YY). Currently, showDatePicker only takes a Locale parameter, which means that I am stuck with the choices that the available locales offer me. To my knowledge, there is no locale which would fit my use-case. As a result, I now display the date in DD/MM/YY everywhere except in the text-based input entry mode of the date-picker where my locale dictates MM/DD/YYYY, which is obviously not ideal.

Proposal

The showDatePicker method should take an optional parameter dateFormat which directly controls how the date may be entered when the user switches to DatePickerEntryMode.input. This format should override the locale's setting if necessary.

This seems to be a duplicate of #83302

The showDatePicker method should take an optional parameter dateFormat which directly controls how the date may be entered when the user switches to DatePickerEntryMode.input. This format should override the locale's setting if necessary.

Since there is no proper class to represent DateFormats in Flutter (DateFormat is from packages:intl), we can mitigate this by introducing a callback providing the selected DateTime and expecting a String in return.

    showDatePicker(
       ....
      dateFormatHandler: (DateTime date) {
        return DateFormat('yyyy-MM-dd').format(date);
      },
     .....
    );

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[material_ui] Support custom date input formatters via CalendarDelega…

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Allow custom date formats for the showDatePicker input mode #97134

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Allow custom date formats for the showDatePicker input mode #97134

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pedromassango commented on Jul 14, 2022

pedromassango commented on Jul 14, 2022

flutter-triage-bot commented on Jan 16, 2025

github-actions commented on Sep 24, 2026

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