passing server date in boot and checking expiry against the server date
diff --git a/public/js/startup.js b/public/js/startup.js
index 1d43f41..c845ab2 100644
--- a/public/js/startup.js
+++ b/public/js/startup.js
@@ -61,7 +61,7 @@
 			erpnext.complete_setup.show(); 
 		}
 		if(wn.boot.expires_on && in_list(user_roles, 'System Manager')) {
-			var today = dateutil.str_to_obj(dateutil.get_today());
+			var today = dateutil.str_to_obj(wn.boot.server_date);
 			var expires_on = dateutil.str_to_obj(wn.boot.expires_on);
 			var diff = dateutil.get_diff(expires_on, today);
 			if (0 <= diff && diff <= 15) {