老板要我"send him the mark by Tuesday."

因为周一办公室里没人,我有一份报告没拿到,所以我就想星期二早上拿到再给他mark.

可结果人家周一下午5:15给我发个email说我overdue了.

可我一向觉得by Tuesday就是no later than Tuesday,我周二早上给他应该不算晚啊.

请问各位by Tuesday应该是哪一天是deadline 呢?