make default date sensible for LBEs

templates/logbookform.html

@@ -32,11 +32,16 @@
            <input name="prev_slug" id="prev_slug" value="{{slug}}" type=hidden>
 
            <span {% if dateflag %}style="color:red"{% endif %}>
+           <span {% if yesterday%}style="color:blue"{% endif %}>
            <label for="date">Date of the activity{% if dateflag %} (cannot change year on an existing entry){% endif %}</label>
            <input {% if not user.username %} disabled{% endif %} 
+		{% if dateflag %}style="color:red"{% endif %}
+		{% if yesterday%}style="color:blue"{% endif %}
            label = "Date" name = "date" size="12"
            title="Date of the activity, a single day,  in ISO format: 2020-08-17"
-             {% if date %}value="{{date}}"{% else %}placeholder="2023-08-12"{% endif %}
+             {% if date %}value="{{date}}"{% else %}
+		{% if yesterday %} value="{{yesterday}}"{% else %}
+		placeholder="2025-08-12"{% endif %}{% endif %}
            required /> 
            </span>
           
@@ -44,6 +49,7 @@
            <span {% if authorflag %}style="color:red"{% endif %}>    
            <label for="author">Your name (author) <a href="/aliases/{{year}}">[valid authors]</a></label>
            <input {% if not user.username %} disabled{% endif %} 
+		{% if authorflag %}style="color:red"{% endif %}
            label = "author" name = "author" size="20"
            title="The person writing the logbook entry"
            {% if author %}value="{{author}}"{% else %}placeholder="Animal"{% endif %}