Fix bug in Date RE

Author: sebbASF

Lib/mailbox.py

@@ -898,7 +898,7 @@ class mbox(_mboxMMDF):
     # This is the full syntax, i.e. From sender asctime[ moreinfo]
     DAY_RE = b' (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)'
     MON_RE = b' (?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)'
-    DTY_RE = b' [ 0]\\d \\d\\d:\\d\\d:\\d\\d \\d{4}' # day, time, year
+    DTY_RE = b' [ 123]\\d \\d\\d:\\d\\d:\\d\\d \\d{4}' # day, time, year
     FULL_RE = b'From \\S+' + DAY_RE + MON_RE + DTY_RE + b'( .+)?' + linesep + b'\\Z'
     # we capture the optional moreinfo group so we can check for lines that end in the date