NSDateFormatter specifiers are a pain, heres a reference.

NSDateFormatter formatting

Z: -0500
ZZ: -0500
ZZZ: -0500
ZZZZ: GMT-05:00

z: EST
zz: EST
zzz: EST
zzzz: Eastern Standard Time

V: EST
VV: 
VVV: 
VVVV: United States Time (New York)

v: ET
vv: 
vvv: 
vvvv: Eastern Time


    NSDateFormatter *f = [[NSDateFormatter alloc] init];
    NSDate *date = [NSDate date];
    [f setDateFormat:@"Z"];
    NSLog(@"Z: %@", [f stringFromDate:date]);
    [f setDateFormat:@"ZZ"];
    NSLog(@"ZZ: %@", [f stringFromDate:date]);
    [f setDateFormat:@"ZZZ"];
    NSLog(@"ZZZ: %@", [f stringFromDate:date]);
    [f setDateFormat:@"ZZZZ"];
    NSLog(@"ZZZZ: %@", [f stringFromDate:date]);
    [f setDateFormat:@"z"];
    NSLog(@"z: %@", [f stringFromDate:date]);
    [f setDateFormat:@"zz"];
    NSLog(@"zz: %@", [f stringFromDate:date]);
    [f setDateFormat:@"zzz"];
    NSLog(@"zzz: %@", [f stringFromDate:date]);
    [f setDateFormat:@"zzzz"];
    NSLog(@"zzzz: %@", [f stringFromDate:date]);
    [f setDateFormat:@"V"];
    NSLog(@"V: %@", [f stringFromDate:date]);
    [f setDateFormat:@"VV"];
    NSLog(@"VV: %@", [f stringFromDate:date]);
    [f setDateFormat:@"VVV"];
    NSLog(@"VVV: %@", [f stringFromDate:date]);
    [f setDateFormat:@"VVVV"];
    NSLog(@"VVVV: %@", [f stringFromDate:date]);
    [f setDateFormat:@"v"];
    NSLog(@"v: %@", [f stringFromDate:date]);
    [f setDateFormat:@"vv"];
    NSLog(@"vv: %@", [f stringFromDate:date]);
    [f setDateFormat:@"vvv"];
    NSLog(@"vvv: %@", [f stringFromDate:date]);
    [f setDateFormat:@"vvvv"];
    NSLog(@"vvvv: %@", [f stringFromDate:date]);