Is there a standard or well-know, de-facto uitility for this?
Arch Linux, EndeavourOS
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It will depend on the DE.
kde or gnome or what DE/WM you using?
if yiu want them timed, you can just put the respective settings command in your crontab
https://hannes.hauswedell.net/post/2023/12/10/darkmode/ mught help with the commands
I never used them since I’m a dark theme kinda lad, but I swore I’ve encountered a few that change from dark to light dependent on time.
With Gnome this extension works really well: https://extensions.gnome.org/extension/2236/night-theme-switcher/