Redmine/app/views/my/blocks/_calendar.rhtml

<h3><%= l(:label_calendar) %></h3>

<%
@date_from = Date.today - (Date.today.cwday-1)
@date_to = Date.today + (7-Date.today.cwday)
@issues = Issue.find :all,
                     :conditions => ["#{Issue.table_name}.project_id in (#{@user.projects.collect{|m| m.id}.join(',')}) AND ((start_date>=? and start_date<=?) or (due_date>=? and due_date<=?))", @date_from, @date_to, @date_from, @date_to],
                     :include => [:project, :tracker]  unless @user.projects.empty?
@issues ||= []
%>

<table class="cal">
<thead><tr>
<td></td>
<% 1.upto(7) do |d| %>
    <th align="center" width="14%"><%= day_name(d) %></th>
<% end %>
</tr></thead>
<tbdoy>
<tr height="100">
<% day = @date_from
while day <= @date_to
	if day.cwday == 1 %>
	<th valign="middle"><%= day.cweek %></th>
	<% end %>	
	<td valign="top" width="14%" class="<%= day.month==@month ? "even" : "odd" %>">
	<p align="right"><%= day==Date.today ? "<b>#{day.day}</b>" : day.day %></p>	
	<% day_issues = []
	@issues.each { |i| day_issues << i if i.start_date == day or i.due_date == day } 
	day_issues.each do |i| %>	
		<%= if day == i.start_date and day == i.due_date
		    image_tag('arrow_bw.png')
		elsif day == i.start_date
		    image_tag('arrow_from.png') 
		elsif day == i.due_date
		    image_tag('arrow_to.png') 
		end %>
		<small><%= link_to_issue i %>: <%=h i.subject.sub(/^(.{30}[^\s]*\s).*$/, '\1 (...)') %></small><br />
	<% end %>
    </td>
	<%= '</tr><tr height="100">' if day.cwday >= 7 and day!=@date_to %>
	<%
	day = day + 1
end %>
</tr>
</tbody>
</table>