diff --git a/erpnext/www/book_appointment/index.js b/erpnext/www/book_appointment/index.js
index c8dd501..5a814c6 100644
--- a/erpnext/www/book_appointment/index.js
+++ b/erpnext/www/book_appointment/index.js
@@ -114,7 +114,7 @@
         timeslot_div.classList.add('unavailable')
     }
     timeslot_div.innerHTML = get_slot_layout(start_time);
-    timeslot_div.id = timeslot.time.substr(11, 20);
+    timeslot_div.id = timeslot.time.substring(11, 19);
     timeslot_div.addEventListener('click', select_time);
     return timeslot_div
 }
diff --git a/erpnext/www/book_appointment/index.py b/erpnext/www/book_appointment/index.py
index 5b60dd5..e4af7e8 100644
--- a/erpnext/www/book_appointment/index.py
+++ b/erpnext/www/book_appointment/index.py
@@ -90,7 +90,7 @@
 
 @frappe.whitelist(allow_guest=True)
 def create_appointment(date, time, tz, contact):
-	format_string = '%Y-%m-%d %H:%M:%S%z'
+	format_string = '%Y-%m-%d %H:%M:%S'
 	scheduled_time = datetime.datetime.strptime(date + " " + time, format_string)
 	# Strip tzinfo from datetime objects since it's handled by the doctype
 	scheduled_time = scheduled_time.replace(tzinfo = None)