NSDate 转换成 NSString
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@
"yyyy-MM-dd HH:mm:ss"
];
NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];
----------------------------------------------------------------------
NSString转换成NSSdate:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@
"yyyy-MM-dd HH:mm:ss"
];
NSDate *date = [dateFormatter dateFromString:@
"2011-11-11 11:11:11"
];