text: #import <Foundation/Foundation.h>
  
  @interface NSDate (BDKKit)
  
  + (NSDate *)dateWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day;
  + (NSDate *)dateFromString:(NSString *)dateString;
  - (NSString *)stringFromFormatString:(NSString *)formatString;
  
  @end
  