openproject/app/views/common/_calendar.html.erb

<table class="cal">
<thead>
<tr><th scope="col" title="<%= l(:label_week) %>" class="week-number"></th><% 7.times do |i| %><th scope="col"><%= day_name( (calendar.first_wday+i)%7 ) %></th><% end %></tr>
</thead>
<tbody>
<tr>
<% day = calendar.startdt
while day <= calendar.enddt %>
<%= "<td class='week-number' title='#{ l(:label_week) }'>#{(day+(11-day.cwday)%7).cweek}</td>".html_safe if day.cwday == calendar.first_wday %>
<td class="<%= day.month==calendar.month ? 'even' : 'odd' %><%= ' today' if Date.today == day %>">
<p class="day-num"><%= day.day %></p>
<% calendar.events_on(day).each do |i| %>
  <% if i.is_a? Issue %>
  <div class="<%= i.css_classes %> tooltip">
  <%= h("#{i.project} -") unless @project && @project == i.project %>
  <% date_img = '' %>
  <% if day == i.start_date and day == i.due_date %>
    <% date_img = image_tag("bullet_diamond.png", :title => l(:text_tip_issue_begin_end_day), :alt => l(:text_tip_issue_begin_end_day),
                                    :class => "imgtag-icon") %>
  <% elsif day == i.start_date %>
    <% date_img = image_tag("bullet_go.png", :title => l(:text_tip_issue_begin_day), :alt => l(:text_tip_issue_begin_day),
                                    :class => "imgtag-icon") %>
  <% elsif day == i.due_date %>
    <% date_img = image_tag("bullet_end.png", :title => l(:text_tip_issue_end_day), :alt => l(:text_tip_issue_end_day),
                                    :class => "imgtag-icon") %>
  <% end %>

  <%= link_to_issue i, :truncate => 30, :before_text => date_img %>
  <span class="tip"><%= render_issue_tooltip i %></span>
  </div>
  <% else %>
  <span>
    <%= h("#{i.project} -") unless @project && @project == i.project %>
    <%= link_to_version i, {}, {:before_text => image_tag("package.png", :title => l(:label_version), :alt => l(:label_version), :class => "imgtag-icon") }%>
  </span>
  <% end %>
<% end %>
</td>
<%= '</tr><tr>'.html_safe if day.cwday==calendar.last_wday and day!=calendar.enddt %>
<% day = day + 1
end %>
</tr>
</tbody>
</table>