add dayOfYear for NSDate

YYKit/Base/Foundation/NSDate+YYAdd.h

@@ -30,6 +30,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, readonly) NSInteger minute; ///< Minute component (0~59)
 @property (nonatomic, readonly) NSInteger second; ///< Second component (0~59)
 @property (nonatomic, readonly) NSInteger nanosecond; ///< Nanosecond component
+@property (nonatomic, readonly) NSInteger dayOfYear; ///< DayOfYear component (0~365/366)
 @property (nonatomic, readonly) NSInteger weekday; ///< Weekday component (1~7, first day is based on user setting)
 @property (nonatomic, readonly) NSInteger weekdayOrdinal; ///< WeekdayOrdinal component
 @property (nonatomic, readonly) NSInteger weekOfMonth; ///< WeekOfMonth component (1~5)

YYKit/Base/Foundation/NSDate+YYAdd.m

@@ -46,6 +46,10 @@ - (NSInteger)nanosecond {
     return [[[NSCalendar currentCalendar] components:NSCalendarUnitSecond fromDate:self] nanosecond];
 }
 
+- (NSInteger)dayOfYear{
+    return [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitYear forDate:self];
+}
+
 - (NSInteger)weekday {
     return [[[NSCalendar currentCalendar] components:NSCalendarUnitWeekday fromDate:self] weekday];
 }