Current time in all timezones on an iphone

alltimezones.m

NSCalendar *cal = [[NSCalendar alloc]
    initWithCalendarIdentifier:NSGregorianCalendar];

for (NSString *tzName in [NSTimeZone knownTimeZoneNames]) {
    cal.timeZone = [NSTimeZone timeZoneWithName:tzName];
    int whichComponents = NSDayCalendarUnit | NSMonthCalendarUnit |
        NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
    NSDateComponents *components = [cal components:whichComponents
                                          fromDate:[NSDate date]];
    NSLog(@"Time in %@: %d-%d-%d %d:%d",
        tzName, components.year, components.month, components.day,
        components.hour, components.minute);
}

[cal release];