[23758] Use datetime object to format date

https://community.openproject.com/work_packages/23758

app/views/meeting_mailer/content_for_review.html.erb

@@ -23,7 +23,7 @@ See doc/COPYRIGHT.md for more details.
 <em><%= @meeting.author %></em>
 
 <ul>
-<li><%=t :label_meeting_date_time %>: <%= format_date @meeting.start_date %> <%= format_time @meeting.start_time, false %>-<%= format_time @meeting.end_time, false %> <%= Time.zone %></li>
+<li><%=t :label_meeting_date_time %>: <%= format_date @meeting.start_time %> <%= format_time @meeting.start_time, false %>-<%= format_time @meeting.end_time, false %> <%= Time.zone %></li>
 <li><%=Meeting.human_attribute_name(:location) %>: <%= @meeting.location %></li>
 <li><%=Meeting.human_attribute_name(:participants_invited) %>: <%= @meeting.participants.invited.sort.join("; ") %></li>
 <li><%=Meeting.human_attribute_name(:participants_attended) %>: <%= @meeting.participants.attended.sort.join("; ") %></li>

app/views/meeting_mailer/content_for_review.text.erb

@@ -22,7 +22,7 @@ See doc/COPYRIGHT.md for more details.
 <%= @meeting.project.name %>: <%= @meeting.title %> (<%= meeting_url(@meeting) %>)
 <%= @meeting.author %>
 
-<%=t :label_meeting_date_time %>: <%= format_date @meeting.start_date %> <%= format_time @meeting.start_time, false %>-<%= format_time @meeting.end_time, false %> <%= Time.zone %>
+<%=t :label_meeting_date_time %>: <%= format_date @meeting.start_time %> <%= format_time @meeting.start_time, false %>-<%= format_time @meeting.end_time, false %> <%= Time.zone %>
 <%= Meeting.human_attribute_name(:location) %>: <%= @meeting.location %>
 <%= Meeting.human_attribute_name(:participants_invited) %>: <%= @meeting.participants.invited.sort.join("; ") %>
 <%= Meeting.human_attribute_name(:participants_attended) %>: <%= @meeting.participants.attended.sort.join("; ") %>