所以对于日期来说，通常会用yyyy--mm--dd这种格式来表示，一方面来说，可读性、兼容性更强；另一方面，因为 yyyy-mm-dd 是固定长度的，它在数据库和电子表格等应用中，往往更容易排序。 yyyy-mm-dd符合国际标准，是ISO 8601日期格式的一部分 [1]，在国际间使用更广泛。
日期和时间YYYY–MM–DD是什么格式怎么填写？1. YYYY- 代表年份，其中 Y 是 Year 的首字母，年份需要用四位数来表示，例如 2021 年。2. MM- 代表月份，M 是 Month 的首字母，月份需要用两位数来表示，例如 1 月用 01
日期格式yyyy-mm-dd和yyyy-mm-dd是相同的。 解释： 日期格式“yyyy-mm-dd”是一种常用的日期表示方法，其中“yyyy”代表年份的四位数字，“mm”代表月份的两位数字，“dd”代表日期的两位数字。这种格式确保了日期的统一性和准确性，易于阅读和排序。在某些系统和应用中，这种格式被强制要求以确保 ...
yyyy-mm-dd与yyyy-m-d皆可表示日期，两者差异在于分隔符的使用。 yyyy-mm-dd格式中，年、月、日之间以短横线相隔，例如2023-09-02表示2023年9月2日，其读性、兼容性较佳，且在数据库和电子表格应用中排序更易。 相反，yyyy-m-d格式使用中横线，例如2023-9-2表示同日。
比如今天是2015年12月28号，ios 中YYYY会算成2016年的12月28号，它把12月28号算成了2016年的第一周，这周的日期直接默认成2016年的了，所以算当天日期的最好不要用YYYY。我的程序从昨天就算成2016年了，我和服务器交互时用当天时间加密，导致所有网络请求都返回错误，加班找了半天才发现问题，说多了 ...
yyyy-MM-dd HH:mm:ss.fff 可以看出，长时间格式，这里面出现了两组“mm”，分别表示月份和分钟。 因此，大多数编程语言第一方或第三方库中，将月份定为大写的M，而分钟定为小写的m，以作为区别。 在某些编程实践中，会有 纯日期类型 （无时间）或 纯时间类型 （无日期），以及 日期时间类型 （都有 ...
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