I point out that the survivors of the Magellan expedition were startled by a date discrepancy.

Twenty crewmen died of starvation by 9 July 1522, when Elcano put into Portuguese Cape Verde for provisions. The crew was surprised to learn that the date was actually 10 July 1522,[104] as they had recorded every day of the three-year journey without omission.

https://en.wikipedia.org/wiki/Magellan_expedition#Return_to_Spain[1]

The full extent of the globe was realised, since their voyage was 14,460 Spanish leagues (60,440 km or 37,560 mi). The global expedition showed the need for an International Date Line to be established. Upon arrival at Cape Verde, the crew was surprised to learn that the ship's date of 9 July 1522 was one day behind the local date of 10 July 1522, even though they had recorded every day of the three-year journey without omission. They lost one day because they travelled west during their circumnavigation of the globe, in the same direction as the apparent motion of the sun across the sky.[150] Although the Kurdish geographer Abu'l-Fida (1273–1331) had predicted that circumnavigators would accumulate a one-day offset,[151] Cardinal Gasparo Contarini was the first European to give a correct explanation of the discrepancy.[152]

https://en.wikipedia.org/wiki/Magellan_expedition#Scientific_accomplishments[2]

I point out that the survivors of the Magellan expedition were startled by a date discrepancy.

Twenty crewmen died of starvation by 9 July 1522, when Elcano put into Portuguese Cape Verde for provisions. The crew was surprised to learn that the date was actually 10 July 1522,[104] as they had recorded every day of the three-year journey without omission.

https://en.wikipedia.org/wiki/Magellan_expedition#Return_to_Spain[1]

The full extent of the globe was realised, since their voyage was 14,460 Spanish leagues (60,440 km or 37,560 mi). The global expedition showed the need for an International Date Line to be established. Upon arrival at Cape Verde, the crew was surprised to learn that the ship's date of 9 July 1522 was one day behind the local date of 10 July 1522, even though they had recorded every day of the three-year journey without omission. They lost one day because they travelled west during their circumnavigation of the globe, in the same direction as the apparent motion of the sun across the sky.[150] Although the Kurdish geographer Abu'l-Fida (1273–1331) had predicted that circumnavigators would accumulate a one-day offset,[151] Cardinal Gasparo Contarini was the first European to give a correct explanation of the discrepancy.[152]

https://en.wikipedia.org/wiki/Magellan_expedition#Scientific_accomplishments[2]

Andhere is a link to a similar question and its answers:

https://hsm.stackexchange.com/questions/13539/at-what-time-people-relized-the-changes-in-times-between-countries/13543#13543[3]