UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
    myButton.frame = CGRectMake(0, 0, 100, 100 );
    myButton.backgroundColor = [UIColor greenColor];
    [[myButton layer] setBorderColor:[[UIColor whiteColor] CGColor]];
    [[myButton layer] setBorderWidth:2.3];
    [[myButton layer] setCornerRadius:15];
    [myButton setClipsToBounds: YES];

    UILabel *date = [[UILabel alloc]initWithFrame:CGRectMake(10, 10, 50, 50 )];
    date.backgroundColor = [UIColor clearColor];
    date.text = @"15";
    //date.adjustsFontSizeToFitWidth = YES;
    date.font = [UIFont boldSystemFontOfSize:30];
    date.alpha = 0.7;
    [myButton addSubview:date];