Time, year, month and day of SMS.

1. Because the time set by the person who sent you the text message is wrong, it sometimes affects the time of the text message, but this is rare.

2. I received a short message from a classmate from another province three days ago, because it was a short message from another province or because of the signal problem of the mobile operator (especially at the end of the month and the beginning of the month).

3. Because the format or content of the short message sent by the other party is too complicated or there is something wrong with it, you will find that you didn't receive it when you sent it, and the mobile operator will find that you received the short message at the wrong time after repairing it.