Time Zones & the International Date Line

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TRAVEL through time, watching the changes, hour by hour, in the standard times of all 24 time zones at once, and learn how the International Date Line works. [see more ...]

At 0:21 it says that when it's 23:00 to 23:59 at the Date Line, the entire world is on the same day. Not so. Time Zone ±12 is bisected by longitude 180°. New Zealand is in its western half (+12) and Baker Island (0°11.5'N, 176°28.5'W) is in its eastern half (-12). At Mon, 11:30 UTC, it is Mon 23:30 in NZ, but in Baker Island it is Sun 23:30. Most places geographically within zone -12 keep the time (or at least the date) of one of their neighbouring zones, but a few do keep day & time at UTC-12.

So during the hour Mon 11:00 to 12:00 UTC, it is Monday everywhere except in Zone -12, where it is still the last hour (23:00 to 23:59) of Sunday. AND something similar is also true in the next hour, when it is Monday everywhere except in zone +12, where it is the first hour (00:00 to 01:00) of Tuesday. Note also, that, unlike the impression conveyed at 0:30 in Shepdi's video, when it is midnight at the Date Line, it is midnight throughout time zone ±12, which straddles the Date Line.

[RB-nmko]

On whats noted as the eastern side of the IDL I see South America and on the western side is Africa. Since this would place them on the wrong hemisphere can you please clarify this?

[JamesBrevoort]

Very, very nice.  My only critique would be to make the map relative to the north pole (or perhaps produce another version of the video with the map that way) — since I'm a northern hemisphere native, that would have facilitated my comprehension.  Thanks so much!

[nelsonferrer]

UTC -12 in Baker and Howland islands equates UTC +12 in Fiji and Anadyr in Russia. UTC -11 in American Samoa, Midway and Niue equates UTC +13 in Samoa (when DST not observed in Samoa), Phoenix Islands in Kiribati, Tonga and Tokelau. UTC -10 in Cook Islands, French Polynesia, Hawaii and Jarvis Island Equates UTC +14 in Kiritimati (In Kiribati's Line Islands) and in Samoa (when DST is observed).