ios获取系统时间

 //获取系统时间
 NSDate * date=[NSDate date];
 NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
 [dateformatter setDateFormat:@"HH:mm"];
  NSString * locationString=[dateformatter stringFromDate:date];

 //[dateformatter setDateFormat:@"YYYY-MM-dd-HH-mm-ss"];
 //NSString * morelocationString=[dateformatter stringFromDate:senddate];

 //获得系统日期
 NSCalendar * cal=[NSCalendar currentCalendar];
 NSUInteger unitFlags=NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit;
 NSDateComponents * conponent= [cal components:unitFlags fromDate:senddate];
 NSInteger year=[conponent year];
 NSInteger month=[conponent month];
 NSInteger day=[conponent day];
 NSString * nsDateString= [NSString stringWithFormat:@"%4d年%2d月%2d日",year,month,day];

 [dateformatter release];