I want to validating from date selection date to To date selction date. I selected 17th July 2022 in FromDate and ToDate selection time only show 4 days(17,18,19,20) how i show only 7 past dates in ToDate Picker in flutter.

DateTime fromDate = DateTime.now(); TimeOfDay fromTime = TimeOfDay.now(); String selectedFromDateTime; String selectedToDateTime; DateTime toDate = DateTime.now(); TimeOfDay toTime = TimeOfDay.now();

Future<void> _showFromDateTimePicker() async {
    final DateTime datePicked = await showDatePicker(
        context: context,
        initialDate: fromDate,
        firstDate: DateTime(1900),
        lastDate: DateTime.now(),builder: (context, child) {
      return Theme(
        data: ThemeData(
          splashColor: AppTheme.card_bg,
          colorScheme: ColorScheme.light(
              primary: AppTheme.card_bg,
              onSecondary: Colors.black,
              onPrimary: Colors.white,
              surface: Colors.black,
              onSurface: Colors.black,
              secondary: Colors.black),
          dialogBackgroundColor: Colors.white,
        ),
        child: child ?? Text(""),
      );
    },);

    if (datePicked != null) {
      final hour = fromTime.hour.toString().padLeft(2, "0");
      final minute = fromTime.minute.toString().padLeft(2, "0");
      final TimeOfDay timePicked =
          await showTimePicker(context: context, initialTime: fromTime,builder: (context, child) {
            return Theme(
              data: ThemeData(
                splashColor: AppTheme.card_bg,
                colorScheme: ColorScheme.light(
                    primary: AppTheme.card_bg,
                    onSecondary: Colors.black,
                    onPrimary: Colors.white,
                    surface: Colors.white,
                    onSurface: Colors.black,
                    secondary: Colors.black),
                dialogBackgroundColor: Colors.white,
              ),
              child: child ?? Text(""),
            );
          },);
      if (timePicked != null) {
        setState(() {
          selectedFromDateTime =
              "${DateFormat("yyyy-MM-dd").format(datePicked)} $hour:$minute"  
                  ":00";
        });
      }
    }
  }

  Future<void> _showToDateTimePicker() async {
    final DateTime datePicked = await showDatePicker(
      context: context,
      initialDate: toDate,
      firstDate: DateTime.now(),
      lastDate: DateTime.now(),
      builder: (context, child) {
        return Theme(
          data: ThemeData(
            splashColor: AppTheme.card_bg,
            colorScheme: ColorScheme.light(
                primary: AppTheme.card_bg,
                onSecondary: Colors.black,
                onPrimary: Colors.white,
                surface: Colors.black,
                onSurface: Colors.black,
                secondary: Colors.black),
            dialogBackgroundColor: Colors.white,
          ),
          child: child ?? Text(""),
        );
      },
    );

    if (datePicked != null) {
      final hour = toTime.hour.toString().padLeft(2, "0");
      final minute = toTime.minute.toString().padLeft(2, "0");
      final TimeOfDay timePicked = await showTimePicker(
        context: context,
        initialTime: toTime,
        builder: (context, child) {
          return Theme(
            data: ThemeData(
              splashColor: AppTheme.card_bg,
              colorScheme: ColorScheme.light(
                  primary: AppTheme.card_bg,
                  onSecondary: Colors.black,
                  onPrimary: Colors.white,
                  surface: Colors.white,
                  onSurface: Colors.black,
                  secondary: Colors.black),
              dialogBackgroundColor: Colors.white,
            ),
            child: child ?? Text(""),
          );
        },
      );
      if (timePicked != null) {
        setState(() {
          selectedToDateTime =
              "${DateFormat("yyyy-MM-dd").format(datePicked)} $hour:$minute"  
                  ":00";
        });
      }
    }
  }

CodePudding user response：

It's quite easy to do, you just need to subtract 7 days from today.

  final sevenDaysBeforeToday =DateTime.now().subtract(Duration(days: 7));

and change firstDate to sevenDaysBeforeToday of showDatePicker

    firstDate: sevenDaysBeforeToday,