如何在 Perl 中将字符串解析为 DateTime 对象? [英] How to parse a string into a DateTime object in Perl?
问题描述
我了解 DateTime
Perl 模块,以及许多 DateTime::Format::
模块来解析特定种类的日期/时间格式.但是,给出了一些日期/时间字符串示例,我如何确定(在编码/设计时,不是在运行时)我应该使用哪个特定模块?
I know about the DateTime
Perl module, and many of the DateTime::Format::
modules to parse specific kinds of date/time formats. However given some examples of date/time strings, how can I figure out (at coding/design time, not at runtime) which specific module should I use?
例如,我想解析这样的字符串:October 28, 2011 9:00 PM PDT
For example, I want to parse strings like: October 28, 2011 9:00 PM PDT
是否有最常见的日期/时间格式的列表,我可以在其中查找并找到最合适的模块?
Is there a list somewhere of the most common date/time formats where I could look this up and find which would be the most suitable module?
我还知道一些模块会在运行时猜测"每个给定字符串的格式并尽力而为.但是,对于敏感的应用程序,我想在设计应用程序时首先(尽可能严格地)确定格式,然后使用一个模块,如果字符串与指定的格式不匹配,它会警告我.
I also know about some modules which try to "guess" the format for each given string at runtime and do their best. But, for sensitive applications, I would like to determine (as strictly as possible) the format first when designing an application, and then use a module which will warn me if a string does not match the specified format.
我应该怎么做?
推荐答案
DateTime::Format::Strptime 获取日期/时间字符串并将它们解析为 DateTime 对象.
DateTime::Format::Strptime takes date/time strings and parses them into DateTime objects.
#!/usr/bin/perl
use strict;
use warnings;
use DateTime::Format::Strptime;
my $parser = DateTime::Format::Strptime->new(
pattern => '%B %d, %Y %I:%M %p %Z',
on_error => 'croak',
);
my $dt = $parser->parse_datetime('October 28, 2011 9:00 PM PDT');
print "$dt
";
模式中使用的字符序列是 POSIX 标准的.有关详细信息,请参阅man strftime".
The character sequences used in the pattern are POSIX standard. See 'man strftime' for details.
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