EmperorTigerstar | The History of the International Date Line: Every Year @EmperorTigerstar | Uploaded August 2024 | Updated October 2024, 16 hours ago.
As European empires went global, the line on where a day starts and ends got more complicated.
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Notes:
- While you could potentially draw a line before the 20th century, there would be many areas where it would be near impossible to determine where they were placed, especially in places where they didn't even use the same calendar or time systems.

Sources:
- timeanddate.com
- oikofuge.com/territories-that-crossed-the-dateline-1
- Wikipedia

Music:
"Water Prelude" by Kevin MacLeod
found at incompetech.com