NSDateFormatter setDateFormat 自定义日期/时间格式

NSDateFormatter *dateFormatter =[[NSDateFormatter alloc] init];
//  NSString *tzStr = [[date description] substringFromIndex:20];
//  NSLog(@"\ndate\t:[%@]\ntime zone\t:[%@]", [date description], tzStr);
//  [dateFormatter setTimeZone:tzStr];
[dateFormatter setDateFormat:@"MM d','h:m a"];
//  [dateFormatter setDateStyle:kCFDateFormatterMediumStyle];
//  [dateFormatter setTimeStyle:kCFDateFormatterShortStyle];
//  [NSLog(@"Local time zone [%@'", [dateFormatter timeZone]);
NSString *dateStr = [dateFormatter stringFromDate:date];

参考:http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns