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Hover data display

hello to all,
I have created the histogram below which gives the number of pub per day. In the black hover data I have the start and end day. Do you know how to display only the start day since it only concerns one day?

Her my code:

    fig.add_trace(go.Histogram(x=dff2['createdAt.$date'],
    marker_color = "#00e39b", 
    xbins=dict(start=start_date, end=end_date, size=size_), autobinx=False
    )) 


    fig.update_layout(
        title_text='Pub', 
        title_x = 0.5,  
        xaxis_title_text='date', 
        yaxis_title_text='number of pub', 
        bargap=0.05,  
        plot_bgcolor="#EBEDEF",
        hovermode="x", 
      )