Fix breadcrumbs

 import operator
+import re
 
+import pendulum
 import web
 from mf import discover_post_type
 from web import tx
 
-__all__ = ["tx", "operator", "discover_post_type", "post_mkdn"]
+__all__ = ["tx", "operator", "discover_post_type", "post_mkdn", "re", "pendulum"]
 
 
 def post_mkdn(content):

 $def with (year, month, day, posts)
+$ p = pendulum.date(year, month, day)
+$var breadcrumbs = (p.format("MM"), p.format("MMMM"))
 $var title: $month $day $year
 
 <ul>

 $def with (permalink, entry, mentions)
 $var title = "?"
 $ p = entry["published"][0]
-$if tx.request.uri.path.startswith("2023"):
+$if re.match("(19|20)\d\d", tx.request.uri.path):
     $var breadcrumbs = (p.format("MM"), p.format("MMMM"), p.format("DD"), p.format("D"))
 $# var body_classes = ["widescreen"]
 $var classes = ["h-entry"]