Timestamp - simple

1. Automate Community
2. Tools

Copies current date and time to the clipboard. You can set a shortcut in the pull down quick panel or if your smartphone doesn't provide quick panel features, just make a shortcut using some app e.g. Shortcut Maker by Rushikesh Kamewar and place the shortcut on the home screen. If you're not satisfied with the timestamp format, go to the "set clipboard" block of the flow and edit the format to that suits your needs.