When your jurisdiction has a law, be it common law or statute, that says it applies. In the US, as far as I know, no states have a year and a day rule.
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That answer changes from day to day and year to year. As a
general rule, the greater the risk, the greater the reward.
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There is no rule. A year is just over 365 days. That is 52 weeks
and 1 day, which results in dates being pushed on by one day in the
week each year, and by 2 days in a leap year.
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for the same reason you need to clarify dates such as 12/11/10.
Is it day, month, year or month, day, year, or year, month, day or
what. If there was no rule for the order of operations, how could
you get the correct answer?