计算合同日期的函数
    英文回答：
    To calculate the contract date, we need to consider the starting date and the duration of the contract. The starting date is the date when the contract becomes effective, and the duration is the length of time the contract will be in effect.
    First, let's determine the starting date. This is usually specified in the contract itself. It could be the date when both parties sign the contract, or it could be a specific date in the future when the contract will take effect. For example, if the contract is signed on January 1, 2023, then the starting date would be January 1, 2023.
    Next, we need to determine the duration of the contract. This is also specified in the contract and can be expressed in different units, such as days, months, or years. For example, if the contract is for a duration of 2 years, then the duration would be 2 years.
    To calculate the contract date, we simply add the duration to the starting date. Using the pr
evious example, if the starting date is January 1, 2023, and the duration is 2 years, then the contract date would be January 1, 2025.
    It's important to note that the contract date is not always the same as the end date of the contract. The contract date is the date when the contract will be in effect, while the end date is the date when the contract will expire. The end date can be calculated by subtracting one day from the contract date. In our example, the end date would be December 31, 2024.
    In conclusion, to calculate the contract date, we need to determine the starting date and the duration of the contract. We then add the duration to the starting date to obtain the contract date. The end date can be calculated by subtracting one day from the contract date.
    中文回答：
    要计算合同日期，我们需要考虑合同的起始日期和合同的持续时间。起始日期是合同生效的日期，而持续时间是合同的有效期。
    首先，让我们确定起始日期。这通常在合同本身中指定。它可以是双方签署合同的日期，也可以是未来的某个特定日期，合同将在该日期生效。例如，如果合同在2023年1月1日签署，那么起始日期就是2023年1月1日。
js当前日期加一天    接下来，我们需要确定合同的持续时间。这也在合同中指定，并可以用不同的单位表示，如天、月或年。例如，如果合同的持续时间是2年，则持续时间为2年。
    要计算合同日期，我们只需将持续时间加到起始日期上。以前面的例子为例，如果起始日期是2023年1月1日，持续时间为2年，则合同日期将是2025年1月1日。
    需要注意的是，合同日期并不总是与合同的结束日期相同。合同日期是合同生效的日期，而结束日期是合同到期的日期。可以通过从合同日期中减去一天来计算结束日期。在我们的例子中，结束日期将是2024年12月31日。
    总之，要计算合同日期，我们需要确定合同的起始日期和持续时间。然后，我们将持续时间加到起始日期上，得到合同日期。通过从合同日期中减去一天，可以计算出结束日期。

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