IOS How to convert string to date format YYYYMM

+ (NSDate*)convertStringToDateYYYYMM:(NSString*)_date{
   
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"yyyyMM"];
    [dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
    [dateFormat setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
    NSDate *date = [dateFormat dateFromString:_date];
    return  date;
}


+ (NSDate*)convertStringToDateYYYYMMDD:(NSString*)_date{
    _date = [_date stringByReplacingOccurrencesOfString:@"T" withString:@" "];
    _date = [_date stringByReplacingOccurrencesOfString:@"Z" withString:@""];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"yyyyMMdd"];
    [dateFormat setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
    [dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
    NSDate *date = [dateFormat dateFromString:_date];
  
    return  date;
}

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