diff --git a/UI/SOGoUI/SOGoDateFormatter.h b/UI/SOGoUI/SOGoDateFormatter.h
index e63df91aa..4d460294d 100644
--- a/UI/SOGoUI/SOGoDateFormatter.h
+++ b/UI/SOGoUI/SOGoDateFormatter.h
@@ -24,7 +24,7 @@
 
 #import <Foundation/NSFormatter.h>
 
-@class NSString, NSDictionary;
+@class NSString, NSCalendarDate, NSDictionary;
 
 @interface SOGoDateFormatter : NSFormatter
 {
@@ -43,6 +43,12 @@
 - (NSString *)stringForObjectValue:(id)_obj;
 
 - (NSString *)shortDayOfWeek:(int)_day;
+- (NSString *)fullDayOfWeek:(int)_day;
+- (NSString *)shortMonthOfYear:(int)_month;
+- (NSString *)fullMonthOfYear:(int)_month;
+
+- (NSString *)isoDateFormatForDate:(NSCalendarDate *)_date;
+- (NSString *)fullWeekdayNameAndDetailsForDate:(NSCalendarDate *)_date;
 
 @end
 
diff --git a/UI/SOGoUI/SOGoDateFormatter.m b/UI/SOGoUI/SOGoDateFormatter.m
index 331243426..c64aca820 100644
--- a/UI/SOGoUI/SOGoDateFormatter.m
+++ b/UI/SOGoUI/SOGoDateFormatter.m
@@ -22,16 +22,6 @@
 #include "SOGoDateFormatter.h"
 #include "common.h"
 
-@interface SOGoDateFormatter (PrivateAPI)
-- (NSString *)shortDayOfWeek:(int)_day;
-- (NSString *)fullDayOfWeek:(int)_day;
-- (NSString *)shortMonthOfYear:(int)_month;
-- (NSString *)fullMonthOfYear:(int)_month;
-
-- (NSString *)isoDateFormatForDate:(NSCalendarDate *)_date;
-- (NSString *)fullWeekdayNameAndDetailsForDate:(NSCalendarDate *)_date;
-@end
-
 @implementation SOGoDateFormatter
 
 - (id)initWithLocale:(NSDictionary *)_locale {