To find out all timezone abbreviation,

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    NSEnumerator *keys = [[NSTimeZone abbreviationDictionary] keyEnumerator];
    NSString* value;
    while ((value = [keys nextObject])) {
        NSLog(@"%@ %@", value, [[NSTimeZone abbreviationDictionary] objectForKey:value] );
    }

Here is the output:

EDT America/New_York
GMT GMT
AST America/Halifax
IRST Asia/Tehran
ICT Asia/Bangkok
PET America/Lima
KST Asia/Seoul
PST America/Los_Angeles
CDT America/Chicago
EEST Europe/Istanbul
NZDT Pacific/Auckland
WEST Europe/Lisbon
EAT Africa/Addis_Ababa
HKT Asia/Hong_Kong
IST Asia/Calcutta
MDT America/Denver
NZST Pacific/Auckland
WIT Asia/Jakarta
ADT America/Halifax
BST Europe/London
ART America/Argentina/Buenos_Aires
CAT Africa/Harare
GST Asia/Dubai
PDT America/Los_Angeles
SGT Asia/Singapore
COT America/Bogota
PKT Asia/Karachi
EET Europe/Istanbul
UTC UTC
WAT Africa/Lagos
EST America/New_York
JST Asia/Tokyo
CLST America/Santiago
CET Europe/Paris
BDT Asia/Dhaka
MSK Europe/Moscow
AKDT America/Juneau
CLT America/Santiago
AKST America/Juneau
BRST America/Sao_Paulo
BRT America/Sao_Paulo
CEST Europe/Paris
CST America/Chicago
HST Pacific/Honolulu
MSD Europe/Moscow
MST America/Denver
PHT Asia/Manila
WET Europe/Lisbon