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Top Forums Shell Programming and Scripting Calculate the calendar date since Jan 1, 2000 Post 302613193 by chihung on Monday 26th of March 2012 11:38:55 PM
Old 03-27-2012
This list provides index to the abbr month name. The 4th column returns from the 'localtime' will give the index of the month. Eg. 2 means Mar. List index starts from 0
Code:
@M=('Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');

localtime is a Perl built-in function that returns second, minute, hour, ..... In our case, we only need the day of the month ($mday), month ($mon), and year ($yr). 946656000 is the epoch time for 2000-01-01, we just need to add the additional seconds for the input days
Code:
($x,$x,$x,$mday,$mon,$yr)=localtime(946656000+86400*$ARGV[0]);

$yr returns 100 for year 2000, therefore we need to add 1900. Also, we need the month in abbr form and therefore we need to refer to the value based on the position in the list @M
Code:
printf("%02d %s %4d",$mday,$M[$mon],$yr+1900);

This User Gave Thanks to chihung For This Post:
 

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Time::localtime(3pm)					 Perl Programmers Reference Guide				      Time::localtime(3pm)

NAME
Time::localtime - by-name interface to Perl's built-in localtime() function SYNOPSIS
use Time::localtime; printf "Year is %d ", localtime->year() + 1900; $now = ctime(); use Time::localtime; use File::stat; $date_string = ctime(stat($file)->mtime); DESCRIPTION
This module's default exports override the core localtime() function, replacing it with a version that returns "Time::tm" objects. This object has methods that return the similarly named structure field name from the C's tm structure from time.h; namely sec, min, hour, mday, mon, year, wday, yday, and isdst. You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your core functions.) Access these fields as variables named with a preceding "tm_" in front their method names. Thus, "$tm_obj->mday()" corresponds to $tm_mday if you import the fields. The ctime() function provides a way of getting at the scalar sense of the original CORE::localtime() function. To access this functionality without the core overrides, pass the "use" an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the "CORE::" pseudo-package. NOTE
While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this. AUTHOR
Tom Christiansen perl v5.8.0 2002-06-01 Time::localtime(3pm)
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