他们知道在闰年的时候，他们能够有“多一天”来提高他们的总产量。
They know that in a leap year, they have "one more day" to improve their overall results.
处理闰年相当简单——如果使用公历，在以年月日为时间间隔的计算中添加额外的一天。
Handling leap year is fairly straightforward—add an extra day, if using the Gregorian calendar, to the year-month or day interval calculations.
还有一些其他技巧可以帮助你确定一年的头几个月的日期——例如，二月的最后一天总是锚日，不管闰年还是平年。
There are other tricks to assist with dates in the first months of the year—for example, the last day of February is always an anchor day, leap year or no.
帕米萨诺和罗梅蒂在7月29日同一天生日，这可是365分之1的小概率，考虑到闰年，可能更小；这是某种预兆吗？
In a 1-out-of-365 chance, or less considering leap year, Palmisano and Rometty share the same birthday, July 29th; is that an omen of some kind?
有2月29日的那一年被称为闰年。
在闰年的时候，日期会跳过一周中的某一天。
闰日或闰年出现的原因是我们的历法并不精确地遵循地球围绕太阳运行的轨道。
The reason for a leap day or a leap year is because our calendar does not follow the Earth's orbit around the sun exactly.
使用这一技巧时不要忘记对闰年做出调整。
Don't forget about the adjustment for leap years when using this trick.
原来1900不是闰年。
每个闰年我们都要在二月底加上一天。
那就是闰年名字得来的原因。
为什么要有闰年？
但能被400整除的世纪年2000年，则为闰年。
But century years divisible by 400, like 2000, would be leap years.
隔多长时间有一次闰年？
闰年每四年来一次[每四年有一个闰年]。
2月29日是闰日；闰年是有添加日的年份。
Feb. 29 is an intercalary day; leap year is an intercalary year.
到奥古斯都时期，“亚历山大历”甚至在闰年包含额外的一天。
By the time of Augustus, the so-called Alexandrian calendar had even incorporated an additional day for leap years.
发现可被100整除的年份不一定是闰年，除非它能被400整除。
Years that are divisible by 100 are not leap years, unless they're also divisible by 400.
儒略历将太阳年划为365.25天，闰年366天，每四年一次。
The Julian calendar approximated the mean tropical year as 365.25 days and proposed 366-day leap years for every one divisible by four.
他们知道在闰年的时候，他们能够有“富余的一天”来提高他们的总产量。
They know that in a leap year, they have “one more day” to improve their overall results.
比如，2000年是闰年，但是1900年不是。因为1900不能被400整除。
For example, the year 2000 was a leap year, but the year 1900 was not, because when divided by 400, it does not render a whole number.
比如，2000年是闰年，但是1900年不是。因为1900不能被400整除。
For example, the year 2000 was a leap year, but the year 1900 was not, because when divided by 400, it does not render a whole number.
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