(GPL-1.0-or-later or Artistic-1.0-perl) and MIT and UCD
Parse and format strptime and strftime patterns
This module implements most of strptime(3), the POSIX function that is the reverse of strftime(3), for DateTime. While strftime takes a DateTime and a pattern and returns a string, strptime takes a string and a pattern and returns the DateTime object associated.
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DateTime is a class for the representation of date/time combinations. It represents the Gregorian calendar, extended backwards in time before its creation (in 1582). This is sometimes known as the "proleptic Gregorian calendar". In this calendar, the first day of the calendar (the epoch), is the first day of year 1, which corresponds to the date which was (incorrectly) believed to be the birth of Jesus Christ.
This package is the shared library for perl.
Common Scalar and List utility subroutines
This package contains a selection of subroutines that people have expressed would be nice to have in the perl core, but the usage would not really be high enough to warrant the use of a keyword, and the size so small such that being individual extensions would be wasteful.
The Carp routines are useful in your own modules because they act like die() or warn(), but with a message which is more likely to be useful to a user of your module. In the case of cluck, confess, and longmess that context is a summary of every call in the call-stack. For a shorter message you can use carp or croak which report the error as being from where your module was called. There is no guarantee that that is where the error was, but it is a good educated guess.
Create DateTime parser classes and objects
DateTime::Format::Builder creates DateTime parsers. Many string formats of dates and times are simple and just require a basic regular expression to extract the relevant information. Builder provides a simple way to do this without writing reams of structural code. Builder provides a number of methods, most of which you'll never need, or at least rarely need. They're provided more for exposing of the module's innards to any sub-classes, or for when you need to do something slightly beyond what is expected.
I would recommend you consider using Params::ValidationCompiler instead. That module, despite being pure Perl, is significantly faster than this one, at the cost of having to adopt a type system such as Specio, Type::Tiny, or the one shipped with Moose.
Establish an ISA relationship with base classes at compile time
Allows you to both load one or more modules, while setting up inheritance from those modules at the same time.