Hi, The description of the RULES field of a Zone line at: https://man7.org/linux/man-pages/man8/zic.8.html#FILES seems garbled: "giving of the amount of time to be added to local standard time effect" It looks like it might be a copy&paste error from the similar text for the SAVE field of a Rule line. I think the first "of" and the "effect" should be removed, but I'm not sure if that's correct.
