Today I'll be showing you how to use Automator to rename multiple files on your Mac. It's very simple but you have to pay attention to the instructions if you want it done right at your first attempt.
Step 1: Open Automator. You can find it in the Applications folder.
Step 2: Once opened, choose Workflow.
Step 3: Now, choose Files & Folders and then double-click on Get Selected Finder Items. Without closing Automator, select all the files you wish to rename.
Step 4: After selecting the files you want to rename, go back to Automator and now double-click on Rename Finder Items, you can find that slightly below Get Selected Finder Items. On the right panel, close the Copy Finder Items section, now choose the settings on the Add Date or Time section (this can be changed, all you have to do is clicking on the drop-down menu below the title and choose Add Text). After choosing the settings you want, click Run and Automator will rename all the files you selected.
Note: This will take you some time until you finally get it working right since you will have to explore the settings on the Add Date or Time section. Don't freak out if you can't get it done as fast as you were expecting. If you have any major troubles with it and actually can't make it, just leave a comment below and I will make a video tutorial.