diff --git a/src/gen/lib/date.py b/src/gen/lib/date.py
index cbc669ded..1ed8d66c5 100644
--- a/src/gen/lib/date.py
+++ b/src/gen/lib/date.py
@@ -1863,3 +1863,10 @@ def lookup_calendar(calendar):
             return pos
     raise AttributeError("invalid calendar: '%s'" % calendar)
 
+def gregorian(date):
+    """Convert given date to gregorian. Doesn't modify the original object."""
+    if date.get_calendar() != Date.CAL_GREGORIAN:
+        date = Date(date)
+        date.convert_calendar(Date.CAL_GREGORIAN)
+    return date
+
diff --git a/src/plugins/textreport/BirthdayReport.py b/src/plugins/textreport/BirthdayReport.py
index 878defcbb..e31a612b1 100644
--- a/src/plugins/textreport/BirthdayReport.py
+++ b/src/plugins/textreport/BirthdayReport.py
@@ -40,6 +40,7 @@ import datetime, time
 from gen.display.name import displayer as global_name_display
 from Errors import ReportError
 from gen.lib import NameType, EventType, Name, Date, Person, Surname
+from gen.lib.date import gregorian
 import Relationship
 from gen.plug.docgen import (FontStyle, ParagraphStyle, GraphicsStyle,
                              FONT_SERIF, PARA_ALIGN_RIGHT,
@@ -232,6 +233,8 @@ class CalendarReport(Report):
                 birth_date = birth_event.get_date_object()
 
             if (self.birthdays and birth_date is not None and birth_date.is_valid()):
+                birth_date = gregorian(birth_date)
+
                 year = birth_date.get_year()
                 month = birth_date.get_month()
                 day = birth_date.get_day()
@@ -316,6 +319,8 @@ class CalendarReport(Report):
                                 for event_ref in fam.get_event_ref_list():
                                     event = self.database.get_event_from_handle(event_ref.ref)
                                     event_obj = event.get_date_object()
+                                    if event_obj is not Date.EMPTY and event_obj.is_valid():
+                                        event_obj = gregorian(event_obj)
                                     year = event_obj.get_year()
                                     month = event_obj.get_month()
                                     day = event_obj.get_day()
diff --git a/src/plugins/webreport/WebCal.py b/src/plugins/webreport/WebCal.py
index ff6828b95..30dd2a9a8 100644
--- a/src/plugins/webreport/WebCal.py
+++ b/src/plugins/webreport/WebCal.py
@@ -69,6 +69,8 @@ from libhtml import Html
 from libhtmlconst import _CHARACTER_SETS, _CC, _COPY_OPTIONS
 from gui.pluginmanager import GuiPluginManager
 
+from gen.lib.date import gregorian
+
 # import styled notes from
 # src/plugins/lib/libhtmlbackend.py
 from libhtmlbackend import HtmlBackend
@@ -1713,11 +1715,3 @@ def get_day_list(event_date, holiday_list, bday_anniv_list):
  
     # return to its caller calendar_build()
     return day_list
-
-def gregorian(date):
-    """Convert given date to gregorian. Doesn't modify the original object."""
-    if date.get_calendar() != gen.lib.Date.CAL_GREGORIAN:
-        date = gen.lib.Date(date)
-        date.convert_calendar(gen.lib.Date.CAL_GREGORIAN)
-    return date
-