@interface NSDate (Category)
- (NSDate *)randomDateInYearOfDate;
@end
@implementation NSDate (Category)
- (NSDate *)randomDateInYearOfDate {
    NSDateComponents *components = [[NSCalendar currentCalendar] components:NSYearCalendarUnit fromDate:self];

    [components setMonth:arc4random_uniform(12)];

    NSRange rangeOfDaysInMonth  = [[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:[[NSCalendar currentCalendar] dateFromComponents:components]];

    [components setDay:arc4random_uniform(rangeOfDaysInMonth.length)];

    return [[NSCalendar currentCalendar] dateFromComponents:components];
}
@end