如何使用Perl进行日期时间比较和计算三角洲？ [英] How can I use Perl to do datetime comparisons and calculate deltas?

问题描述

我从人类可读的文本中提取了年，月，日，时，分，秒和毫秒的数据（它不是时间戳格式，而是像在HH：MM：SS.SSS on DD MMM YYYY并以HH：MM：SS.SSSS在DD MMM YYYY结束），因此对于每个记录的事件，我都有每个值。

然而，我需要把它们变成某种时间戳，所以我可以做数学 - 我想确定事件持续多久（结束时间 - 开始时间）。我希望时间函数将参数，所以我可以创建两个任意的时间，但不会出现如果可能，我想要坚持使用可以添加到项目的核心Perl库或脚本中的功能，因为获取CPAN模块

解决方案

p>您可以使用时间：本地来执行此操作。它基本上与内置的本地时间功能相反，因此您可以从标准日期生成时间戳。

I extracted year, month, day, hour, minute, second, and millisecond data from human readable text (it wasn't in a timestamp format, but rather something like "X started at HH:MM:SS.SSS on DD MMM YYYY and ended at HH:MM:SS.SSSS on DD MMM YYYY"), so for each recorded event, I have each of the values.

However, I need to turn those into some kind of timestamp so I can do math on it - I want to determine how long the event lasted (end time - start time). I was hoping the time function would take parameters so I can create two arbitrary times, but that doesn't appear to be the case.

If possible, I would like to stick with functions available in the core Perl libraries or scripts that I can add to the project, since getting CPAN modules installed on the target machines would just make a headache for everyone, if it is even possible to get the modules through the security restrictions.

解决方案

You can do it with Time:Local. It's basically the reverse of the built in "localtime" function, so you can generate a timestamp from a standard date.

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