objective-c获取当前时间

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NSDateFormatter *nsdf2=[[[NSDateFormatter alloc] init]autorelease];
 
[nsdf2 setDateStyle:NSDateFormatterShortStyle];
 
[nsdf2 setDateFormat:@"YYYYMMDDHHmmssSSSS"];
 
NSString *t2=[nsdf2 stringFromDate:[NSDate date]];
 
long curr=[t2 longLongValue];