What if I forget to write the date after sending a text message?

You can edit another date and send it immediately.

Generally, when a mobile phone receives a text message, it will prompt the time of receipt, so it doesn't matter if there is no editing date.

The inventor of mobile phone short message is Finnish. Because Nordic people are sensitive and don't like to express by phone, they invented short message on a whim. Short message is a telecommunication service in digital mobile communication system. It is a non-real-time and non-voice data communication service to transmit text or digital short messages through the signaling channel and signaling network of mobile communication system.