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It is a factor of two evils. This is where the other file is that affects clock settings.
2.4 How Linux keeps Track of Time Zones
You probably set your time zone correctly when you installed Linux. But if you have to change it for some reason, or if the local laws regarding DST have changed (as they do frequently in some countries), then you'll need to know how to change it. If your system time is off by some exact number of hours, you may have a time zone problem (or a DST problem).
Time zone and DST information is stored in /usr/share/zoneinfo (or /usr/lib/zoneinfo on older systems). The local time zone is determined by a symbolic link from /etc/localtime to one of these files. The way to change your timezone is to change the link. If your local DST dates have changed, you'll have to edit the file.
The Archwiki has saved my rear a few times when working with Linux. I always use Webmin on those machines that are servers. I used to swap between Linux Mint and Windows 10 when 10 first came out. I would keep a up to date cloned image on my NAS, so that I could use Clonezilla to swap the install on my Laptop that I had at that time. I do not even bother with dual boot on my Macbook Air, since my wife has Windows 10 on her laptop.
Just add to the post-its or bookmark. You always have to know about the whole UTC stuff when programming. Look at how the whole saving a couple of bits got everyone running around like Chicken Little when they believed that the whole world would end on 01/01/01. Or was it 01/01/00.