时间戳转换为时间

+(NSString *)dateStyle:(NSString *)date{
    
    NSString *invalidTime=[NSString stringWithFormat:@"%f",[date  doubleValue]/1000];//时间戳
    
     NSTimeInterval effectTime=[invalidTime doubleValue]+28800;//因为时差问题要加8小时 == 28800
    
    NSDate *effectDate=[NSDate dateWithTimeIntervalSince1970:effectTime];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    
    NSString *effectDateStr = [dateFormatter stringFromDate: effectDate];
    return effectDateStr;
}