IOS-NSDate自己挖的坑，自己跳

 1     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 2 
 3     [dateFormatter setDateFormat:@"yyyy/MM/dd hh:mm:ss"];
 4 
 5     NSLog(@"0:%@",[dateFormatter stringFromDate:[NSDate date]]);
 6 
 7     
 8 
 9     [dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
10 
11     NSLog(@"1:%@",[dateFormatter stringFromDate:[NSDate date]]);
12 
13     
14 
15     [dateFormatter setTimeZone:[NSTimeZone defaultTimeZone]];
16 
17     NSLog(@"2:%@",[dateFormatter stringFromDate:[NSDate date]]);
18 
19     
20 
21     [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
22 
23     NSLog(@"3:%@",[dateFormatter stringFromDate:[NSDate date]]);
24 
25     
26 
27     [dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"Asia/Shanghai"]];
28 
29     NSLog(@"4:%@",[dateFormatter stringFromDate:[NSDate date]]);
30 
31     
32 
33     [dateFormatter setTimeZone:[[NSTimeZone alloc] initWithName:@"Asia/Shanghai"]];
34 
35     NSLog(@"5:%@",[dateFormatter dateFromString:[dateFormatter stringFromDate:[NSDate date]]]);
36 
37