diff --git a/THCalendarDatePicker/THDatePickerViewController.m b/THCalendarDatePicker/THDatePickerViewController.m
index 07995d9..6c6e34b 100755
--- a/THCalendarDatePicker/THDatePickerViewController.m
+++ b/THCalendarDatePicker/THDatePickerViewController.m
@@ -59,7 +59,7 @@ - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     if (self) {
         // Custom initialization
-        _calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
+        _calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
         _allowClearDate = NO;
         _allowSelectionOfSelectedDate = NO;
         _clearAsToday = NO;