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Unexpected code decoding on New Year's Day
The history of New Year's Day is derived from the ancient Roman calendar system. The first day of the first year of January 1 was first applied in 153 BC.
Roman Calendar
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The reason for February is only 28 or 29 days
Each calendar month has between 30 and 31 days, but February is only 28 or 29 days if it is a leap year, due to the retention of the previous Roman calendar.