IOS 将毫秒数转换为年月日时分秒的时间

   NSString  *_overTimeStr =  [UtilConvertStrToTime:@"1439348978000"];

   NSLog(@"-------_overTimeStr:%@",_overTimeStr);

+ (NSString *)ConvertStrToTime:(NSString *)timeStr

{

    longlong time=[timeStr longLongValue];

    NSDate *d = [[NSDatealloc]initWithTimeIntervalSince1970:time/1000.0];

    NSDateFormatter *formatter = [[NSDateFormatteralloc]init];

    [formatter setDateFormat:@"yyyy/MM/dd HH:mm:ss"];

    NSString*timeString=[formatterstringFromDate:d];

    return timeString;

}

打印结果：

2015-08-13 13:54:29.678 Tpper[3847:111053] -------_overTimeStr:2015/08/12 11:09:38