diff --git a/frappe/core/doctype/language/language.py b/frappe/core/doctype/language/language.py
index f108dd5749..83d68acb36 100644
--- a/frappe/core/doctype/language/language.py
+++ b/frappe/core/doctype/language/language.py
@@ -38,4 +38,4 @@ def update_language_names():
 		data = json.loads(f.read())
 
 	for l in data:
-		frappe.db.set_value('Language', l['code'], 'language_name', l['name'])
+		frappe.db.set_value('Language', l['code'], 'language_name', l['name'])
\ No newline at end of file
diff --git a/frappe/utils/data.py b/frappe/utils/data.py
index e0bbdff847..769eff5330 100644
--- a/frappe/utils/data.py
+++ b/frappe/utils/data.py
@@ -8,6 +8,7 @@ import frappe
 import operator
 import re, urllib, datetime, math
 import babel.dates
+from babel.core import UnknownLocaleError
 from dateutil import parser
 from num2words import num2words
 import HTMLParser
@@ -214,10 +215,18 @@ def formatdate(string_date=None, format_string=None):
 	if not format_string:
 		format_string = get_user_format().replace("mm", "MM")
 
-	return babel.dates.format_date(date, format_string, locale=(frappe.local.lang or "").replace("-", "_"))
+	try:
+		formatted_date = babel.dates.format_date(date, format_string, locale=(frappe.local.lang or "").replace("-", "_"))
+	except UnknownLocaleError:
+		formatted_date = date.strftime("%Y-%m-%d")
+	return formatted_date
 
 def format_time(txt):
-	return babel.dates.format_time(get_time(txt), locale=(frappe.local.lang or "").replace("-", "_"))
+	try:
+		formatted_time = babel.dates.format_time(get_time(txt), locale=(frappe.local.lang or "").replace("-", "_"))
+	except UnknownLocaleError:
+		formatted_time = get_time(txt).strftime("%H:%M:%S")
+	return formatted_time
 
 def format_datetime(datetime_string, format_string=None):
 	if not datetime_string:
@@ -227,7 +236,11 @@ def format_datetime(datetime_string, format_string=None):
 	if not format_string:
 		format_string = get_user_format().replace("mm", "MM") + " HH:mm:ss"
 
-	return babel.dates.format_datetime(datetime, format_string, locale=(frappe.local.lang or "").replace("-", "_"))
+	try:
+		formatted_datetime = babel.dates.format_datetime(datetime, format_string, locale=(frappe.local.lang or "").replace("-", "_"))
+	except UnknownLocaleError:
+		formatted_datetime = datetime.strftime('%Y-%m-%d %H:%M:%S')
+	return formatted_datetime
 
 def global_date_format(date):
 	"""returns date as 1 January 2012"""