* Currently, the tz database say Nauru use LMT until 1921, and then switched to GMT+11:30 for the next two decades. * However, a number of timezone map published in America/Japan back then showed its timezone as GMT+11 per https://wiki.suikawiki.org/n/ナウルの標準時 * And it would also be nice if the 1921 transition date could be sourced. * The tz database currently show Nauru use GMT+9 within the time of 1942 Mar 15 and 1944 Aug 15, however the correspondence is not exact as Nauru was still under Japanese rule until year 1945. And I don't think it's likely for such switch to occur during WWII so it's probably an error. * Currently tz database shows the +11:30 -> +12 transition date as 1979 May, however the "Nauru Standard Time Act 1978 Time Change" http://ronlaw.gov.nr/nauru_lpms/files/gazettes/4b23a17d2030150404db7a5fa5872... based on "Nauru Standard Time Act 1978 Time Change" http://www.paclii.org/nr/legis/num_act/nsta1978207/ defined that "Nauru Alternative Time" (GMT+12) should be in effect from 1979 Feb. Thus it appears that the current tz database transition time might be incorrect.