A little wonder, every day
The Gregorian reform was not adopted worldwide at once
Історичний твір про григоріанську реформу; живопис,не фотографія календарного переходу / Historical artwork concerning Gregorian reform; painting,not a photograph of the calendar transition.
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Pope Gregory XIII introduced the 1582 calendar reform, adjusting leap-year rules and accumulated date drift. In the first adopting countries, October 4 was followed by October 15. Weekdays continued sequentially, and countries adopted the calendar at different times. Thus 1582 marks the reform’s beginning rather than a simultaneous worldwide calendar switch.