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This package allows a tied hash to load its values automatically on the first access, and to use the cached value on the following accesses.
This module provides the ability to use references as hash keys if you first "tie" the hash variable to this module. Normally, only the keys of the tied hash itself are preserved as references; to use references as keys in hashes-of-hashes, use Tie::RefHash::Nestable, included as part of Tie::RefHash.
The Tie::RefHash module can be used to access hashes by reference. This is useful when you index by object, for example.
This package provides an object-oriented interface to Perl built-in gmtime() and localtime () functions.
The Time::HiRes module implements a Perl interface to the usleep, nanosleep, ualarm, gettimeofday, and setitimer/getitimer system calls, in other words, high resolution time and timers.
This module provides functions that are the inverse of built-in perl functions localtime() and gmtime(). They accept a date as a six-element array, and return the corresponding time(2) value in seconds since the system epoch (Midnight, January 1, 1970 GMT on Unix, for example). This value can be positive or negative, though POSIX only requires support for positive values, so dates before the system's epoch may not work on all operating systems.
Time-modules provides several Perl modules, including Time::CTime, Time::DaysInMonth, Time::JulianDay, Time::ParseDate, and Time::Timezone. These modules can be useful for parsing and manipulating dates and times.