On systems without an RTC, systemd currently sets the clock to a compile-time epoch value, derived from the NEWS file in the repository. This is not ideal as the initial clock hence depends on the last time systemd was built, not when the image was compiled. Let's provide a different way here and look at `/usr/lib/clock-epoch`. If that file exists, it's timestamp for the last modification will be used instead of the compile-time default.
System and Service Manager
Details
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