time_progress_tracker/lib/widgets/buttons/date_picker_btn.dart

import 'package:flutter/material.dart';

class DatePickerBtn extends StatelessWidget {
  final String leadingString;
  final DateTime pickedDate;
  final void Function(DateTime) onDatePicked;

  DatePickerBtn({
    @required this.leadingString,
    @required this.pickedDate,
    @required this.onDatePicked,
  }) : super();

  void _onButtonPressed(BuildContext context) async {
    onDatePicked(await showDatePicker(
      context: context,
      initialDate: pickedDate,
      firstDate: DateTime(1900),
      lastDate: DateTime(2100),
    ));
  }

  @override
  Widget build(BuildContext context) {
    ThemeData appTheme = Theme.of(context);
    return TextButton(
      onPressed: () => _onButtonPressed(context),
      child: Text(
          "$leadingString ${pickedDate.toLocal().toString().split(" ")[0]}"),
      style: TextButton.styleFrom(
        primary: appTheme.primaryTextTheme.button.color,
        backgroundColor: appTheme.accentColor,
      ),
    );
  }
}