> For the complete documentation index, see [llms.txt](https://documentation.soulver.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.soulver.app/zh/yu-fa-can-kao/dates/dates-and-times.md). # 日历计算 ### 从日期增加或减去时间 ``` 10 June + 3 weeks | 1 July April 1, 2019 − 3 months 5 days | 27 December 2018 12/02/1988 + 32 years | 12 February 2020 01.05.2005 + 3 years 2 months 3 weeks | 22 July 2008 3 weeks after March 14, 2019 | 4 April 2019 28 days before March 12 | 12 February 2 months 3 days after June 5 | 8 August yesterday - 8 weeks 3 days | 12 July Yesterday + 1 week | 11 June ``` ### 获取相对于当前日期的日期 ``` today + 3 weeks | 1 October now − 1 month | 5 May 4 days from now | 14 September 3 days ago | 7 September ``` ### **查找两个日期之间的时间量** ``` January 10 - February 5 | 3 weeks 5 days 3 March to 30 May | 2 months 3 weeks 6 days days since July 15 | 57 days days till December 25 | 106 days days between 3 March and 30 May | 88 days 1978 to 2021 | 42 years ``` {% hint style="info" %} 时间间隔是从第一个日期的中午到最后一个日期的中午计算的。 如果您想将起始和结束日期都包含在间隔内，请使用包含间隔函数（参见 [下面](#inclusive-intervals-of-time-1)） {% endhint %} ### 两个日期之间的包含时间间隔 ``` April 1 through April 30 in days | 30 days ``` ### 周数（ISO 8601） ``` week of year | 36 week number on march 12, 2021 | 10 ``` ### **一个月或一个季度有多少天** ``` days in Q3 | 92 days days in February 2020 | 29 days ``` ### 查找两个日期之间的中点 ``` midpoint between March 12 and April 5 | 24 March halfway between today and next Thursday | 13 September ``` ## 关于日历计算歧义性的说明 **模糊的月份** 与天和周不同，月份在秒的定义上并不明确。Soulver 会根据表达式尝试执行最合乎逻辑的操作。它很擅长考虑到闰年和其他日历的特殊情况： ``` Feb 28 + 1 month | 28 March January 31 2020 + 1 month | February 29 2020 ``` **未指定年份的日期** 没有指定年份的日期可能会使用当前年份或下一年。 ``` # In December 2019 // 假设下一年，因为最近的一月在未来 January 12 + 3 weeks | 2 February 2020 // 假设今年，因为月份仍然在近期过去 November 1 - 5 days | 27 October 2019 ```