quid_faciam_hodie/lib/widgets/days_of_week_strip.dart

import 'package:flutter/material.dart';
import 'package:flutter_calendar_widget/flutter_calendar_widget.dart';
import 'package:intl/intl.dart';

class DaysOfWeekStrip extends StatelessWidget {
  final DayOfWeek startOfWeek;

  const DaysOfWeekStrip({
    Key? key,
    this.startOfWeek = DayOfWeek.mon,
  }) : super(key: key);

  int getWeekdayNumber(DayOfWeek weekday) =>
      DayOfWeek.values.indexOf(weekday) + 1;

  @override
  Widget build(BuildContext context) {
    return Table(
      children: [
        TableRow(
          children: List.generate(
            7,
            (index) => Container(
              child: Align(
                child: Text(
                  DateFormat.E().format(
                    DateTime(1900, 1, 1)
                        .add(
                          Duration(days: index),
                        )
                        .add(
                          Duration(
                            days: 8 - getWeekdayNumber(DayOfWeek.mon),
                          ),
                        ),
                  ),
                ),
              ),
            ),
          ),
        ),
      ],
    );
  }
}