diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -2179,7 +2179,7 @@
             try:
                 d["d"] = days
                 return parsedate(date, extendeddateformats, d)[0]
-            except Abort:
+            except error.ParseError:
                 pass
         d["d"] = "28"
         return parsedate(date, extendeddateformats, d)[0]
diff --git a/tests/test-parse-date.t b/tests/test-parse-date.t
--- a/tests/test-parse-date.t
+++ b/tests/test-parse-date.t
@@ -286,3 +286,9 @@
   $ hg debugdate "2016-07-27 121021Z"
   internal: 1469621421 0
   standard: Wed Jul 27 12:10:21 2016 +0000
+
+Test parsing months
+
+  $ for i in Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec; do
+  >   hg log -d "$i 2018" -r null
+  > done