Various Time and Date by HarryAwanda
https://www.deviantart.com/harryawanda/art/Various-Time-and-Date-788687783
https://www.reddit.com/r/wallpaper/comments/cltnjx/astronaut_2560_x_1440/
Download the wallpaper and Date & Time widget from this repo or the website. Do note that installing something from deviantart.com requires an account.
Download Rainmeter. You can Hide your taskbar without any third party software.
Note: If your resolution is smaller than 2560x1440 and you want the wallpaper with borders, follow these steps (Firefox):
Right click the wallpaper -> Open Image in New Tab -> Right Click again -> Set Image as Desktop Background -> Choose Position "Stretch" and click on Set as desktp background.
After you have finished downloading Rainmeter, follow this guide to install Rainmeter. After installation several widgets will appear just right click on them click on Unload.
Now go to the Time and date skin file after you have downloaded it, click on it and press Enter
key and install the skin. Open Rainmeter from your tray and expand the "Various Time and Date folder". Now expand the "Clock" and "Time and Date" folders and click on each .ini file and click on the "load" button each time and see which one you like. You can also change text color and Time format from the Settings.ini folder.