For example, i want Light Mode to activate at 6:00, and i want Dark Mode to activate at 22:00.
gsettings set org.mate.desktop.interface gtk-theme 'Adwaita'
gsettings set org.mate.desktop.interface gtk-theme 'Adwaita-dark'
Test if this sample command let's you set the mode.
If yes, you can set two cron jobs, one at 6am to issue the first and a cron job at 10pm to issue the second. I do not have 20.10 to test though
0 6 * * * gsettings set org.mate.desktop.interface gtk-theme 'Adwaita'
0 22 * * * gsettings set org.mate.desktop.interface gtk-theme 'Adwaita-dark'
HTH
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Are there alternatives? and also, where do i enter all those commands? in the terminal, or another program?
You might try Redshift, a color temperature auto-adjuster.
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Already using it, mdooley.