ant-design-blazor/components/date-picker/internal/DatePickerDatePanel.razor

@namespace AntDesign.Internal
@typeparam TValue
@inherits DatePickerPanelBase<TValue>

@{
    var calendar = CultureInfo.Calendar;

    DateTime monthFirstDayDate = new DateTime(PickerValue.Year, PickerValue.Month, 1, 0, 0, 0);    
    int monthFirstDayOfWeek = (int)calendar.GetDayOfWeek(monthFirstDayDate);

    // sunday should be 7
    if (monthFirstDayOfWeek == 0)
    {
        monthFirstDayOfWeek = DayOfWeekHelper.GetDiffForDayOfWeek(Locale.FirstDayOfWeek);
    }

    int diffDay = (int) Locale.FirstDayOfWeek - monthFirstDayOfWeek;
    DateTime startDate = monthFirstDayDate.AddDays(diffDay);	
}

<div class='@($"{PrefixCls}-panel")' @ref="Ref">
    <DatePickerTemplate TValue="TValue"
                        @attributes="GetAttritubes()"
                           MaxRow="6"
                           MaxCol="7"
                           ViewStartDate="startDate"
                           ShowFooter="@ShowToday"
                           GetRowClass="GetRowClass"
                           IsInView="date => DateHelper.IsSameMonth(date, PickerValue)"
                           IsToday="date => DateHelper.IsSameDay(date, DatePicker.CurrentDate)"
                           IsSelected="date => !IsWeek && DateHelper.IsSameDay(date, Value)"
                           GetColTitle='date => date.ToString(Locale.Lang.DateFormat, CultureInfo)'
                           OnRowSelect="OnRowSelect"
                           OnValueSelect="OnValueSelect"
                           GetNextColValue="date => DateHelper.AddDaysSafely(date, 1)">
        <RenderPickerHeader>
            <DatePickerHeader TValue="TValue"
                              @attributes="GetAttritubes()"
                              ShowSuperPreChange="@(!(IsRange && PickerIndex == 1))"
                              ShowPreChange="@(!(IsRange && PickerIndex == 1))"
                              ShowNextChange="@(!(IsRange && PickerIndex == 0))"
                              ShowSuperNextChange="@(!(IsRange && PickerIndex == 0))"/>
        </RenderPickerHeader>
        <RenderTableHeader>
            <tr>
                @if (IsWeek)
                {
                    <th></th>
                }
                @foreach(string weekDay in Locale.Lang.ShortWeekDays)
                {                    
                    <th>@(weekDay)</th>
                }
            </tr>
        </RenderTableHeader>
        <RenderFirstCol>
            @if (IsWeek)
            {				
                <td class="@(PrefixCls)-cell @(PrefixCls)-cell-weak">
                    @DateHelper.GetWeekOfYear(context, Locale.FirstDayOfWeek)
                </td>
            }
        </RenderFirstCol>
        <RenderColValue Context="currentColDate">
            @currentColDate.Day
        </RenderColValue>
    </DatePickerTemplate>
</div>

@if (RenderExtraFooter != null && !IsRange)
{
    <div class="@(PrefixCls)-footer">
        <div class="@(PrefixCls)-footer-extra">
            @RenderExtraFooter
        </div>
    </div>
}

@if (ShowToday && !IsRange && Picker != DatePickerType.Time)
{
    <div class="@(PrefixCls)-footer">
        <a class="@(PrefixCls)-today-btn"
           @onclick="e => { OnSelectDate(DateTime.Now); Close(); }">
            @Locale.Lang.Today
        </a>
    </div>
}


@code {
    [Parameter]
    public bool IsWeek { get; set; } = false;

    [Parameter]
    public bool ShowToday { get; set; } = false;

    private string GetRowClass(DateTime viewDate)
    {
        string selectedRowClass = IsWeek && DateHelper.IsSameWeak(viewDate, Value, Locale.FirstDayOfWeek) ? $"{PrefixCls}-week-panel-row-selected" : "";
        string rowClass = IsWeek ? $"{PrefixCls}-week-panel-row" : "";

        return $"{rowClass} {selectedRowClass}";
    }

    private void OnRowSelect(DateTime viewDate)
    {
        if (IsWeek)
        {
            OnSelectDate(viewDate);
        }
    }

    private void OnValueSelect(DateTime viewDate)
    {
        if (!IsWeek)
        {
            OnSelectDate(viewDate);
        }
    }
}