To add an accurate date and time stamp to your videos, you can use video editing software or apps that offer this feature. Some popular options include Adobe Premiere Pro, Final Cut Pro, iMovie, and Filmora. These tools allow you to import your video and overlay a customizable date and time stamp onto the footage. You can adjust the position, font, size, and format of the timestamp to match your preferences. Simply search for "video editing software with date and time stamp" to find suitable options for your specific device or operating system.