Flutter Date & Time Picker.dart

  Future pickDateTime(BuildContext context) async {
    final date = await pickDate(context);
    if (date == null) return;

    final time = await pickTime(context);
    if (time == null) return;

    setState(() {
      dateTime = DateTime(
        date.year,
        date.month,
        date.day,
        time.hour,
        time.minute,
      );
      String formattedDate =
          DateFormat('yyyy-MM-dd - kk:mm:a').format(dateTime);
      List<String> dateTimeList = formattedDate.split(' - ');
      _date = dateTimeList[0];
      _time = dateTimeList[1];

      List<String> timeList = _endingTime.split(':');
      String hour = timeList[0];
      String minute = timeList[1];
      String amPm = timeList[2];
      if (int.parse(hour) > 12) {
        hour = (int.parse(hour) - 12).toString();
      }
      _time = hour + ':' + minute + ' ' + amPm;
      _timeController.text = "On " + _date + " At " + _time;
    });
  }

  Future<DateTime> pickDate(BuildContext context) async {
    final initialDate = DateTime.now();
    final newDate = await showDatePicker(
      context: context,
      initialDate: dateTime ?? initialDate,
      firstDate: DateTime(DateTime.now().year - 1),
      lastDate: DateTime(DateTime.now().year + 1),
    );

    if (newDate == null) return null;

    return newDate;
  }

  Future<TimeOfDay> pickTime(BuildContext context) async {
    final initialTime = TimeOfDay(hour: 9, minute: 0);
    final newTime = await showTimePicker(
      context: context,
      initialTime: dateTime != null
          ? TimeOfDay(hour: dateTime.hour, minute: dateTime.minute)
          : initialTime,
    );

    if (newTime == null) return null;

    return newTime;
  }