> your computer’s internal clock doesn’t actually go forward or back one hour Kind of, there's multiple "internal clock"s. Windows (in)famously uses localtime

> your computer’s internal clock doesn’t actually go forward or back one hour Kind of, there's multiple "internal clock"s. Windows (in)famously uses localtime instead of UTC by default for the RTC (stored in CMOS) which has caused many bugs (would list them all but my old bookmarks to MS KB pages were all broken by MS's site redesign), and setting the (unsupported) HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\RealTimeIsUniversal registry key causes yet more bugs. A hilarious one was Windows getting stuck in a loop continuously changing the time back to 01:00 every time it reached 02:00 because it couldn't persist the "InDST" flag.