The calendar

A worked example: a calendar as a Viewdata service. It is the framework’s own example, built from the standard library alone — no archive, no network and nothing to configure — so the framework is exercised by a service with nothing in common with a forum.

The numbering

Its pages, from the module’s own docstring:

    1           the index
    2           the date and time now
    3           this month
    32<date>    the month containing a date
    4           the days to come
    42<date>    one day
    9           about
    90          log off
    92 93 94    history, contents, keywords (the framework's own)

Running it

uv run sextile serve calendar_viewdata:app          # answer calls
uv run sextile render calendar_viewdata:app --page 3   # or just draw a page

This month

build_application(now=) takes the clock, so a fixed one draws the same month every time:

from datetime import UTC, datetime

from calendar_viewdata import build_application

app = build_application(now=lambda: datetime(2026, 8, 1, tzinfo=UTC))

 AUGUST 2026                          3a
  
 MO  TU  WE  TH  FR  SA  SU             
                       1   2            
  3   4   5   6   7   8   9             
 10  11  12  13  14  15  16             
 17  18  19  20  21  22  23             
 24  25  26  27  28  29  30             
 31                                     
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
  
 A previous month, D next month, 0 index

The calendar’s design note records that it needed no framework change at all, which is the point of a second application: everything it draws — the month grid, the days to come, the about page — is built from the parts the framework already had. What the framework lacked was found by the two services that are not made of the standard library, on the The forum and The weather pages.