POSIX::1003::Time - POSIX handling time
use POSIX::1003::Time; tzset(); # set-up local timezone from $ENV{TZ} ($std, $dst) = tzname; # timezone abbreviations $str = ctime($timestamp); # is equivalent to: $str = asctime(localtime($timestamp)) $str = strftime("%A, %B %d, %Y", 0, 0, 0, 12, 11, 95, 2); # $str contains "Tuesday, December 12, 1995" $timestamp = mktime(0, 30, 10, 12, 11, 95); print "Date = ", ctime($timestamp); print scalar localtime; my $year = (localtime)[5] + 1900; $timespan = difftime($end, $begin);
Warning: the functions asctime(), mktime(), and strftime() share a weird complex encoding with localtime() and gmtime(): the month (mon), weekday (wday), and yearday (yday) begin at zero. I.e. January is 0, not 1; Sunday is 0, not 1; January 1st is 0, not 1. The year (year) is given in years since 1900. I.e., the year 1995 is 95; the year 2001 is 101.
mon
wday
yday
year
The asctime function uses strftime with a fixed format, to produce timestamps with a trailing new-line. Example:
asctime
strftime
"Sun Sep 16 01:03:52 1973\n"
The parameter order is the same as for strftime() without its $format parameter:
$format
my $str = asctime($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst);
The amount of spent processor time in microseconds.
# equivalent my $str = ctime $timestamp; my $str = asctime localtime $timestamp;
Difference between two TIMESTAMPs, which are floats.
$timespan = difftime($end, $begin);
Simply "gmtime" in perlfunc
Simply "localtime" in perlfunc
Convert date/time info to a calendar time. Returns "undef" on failure.
my $t = mktime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = -1) # Calendar time for December 12, 1995, at 10:30 am $timestamp = mktime(0, 30, 10, 12, 11, 95); print "Date = ", ctime($time_t);
The formatting of strftime is extremely flexible but the parameters are quite tricky. Read carefully!
my $str = strftime($fmt, $sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst);
If you want your code to be portable, your $format argument should use only the conversion specifiers defined by the ANSI C standard (C89, to play safe). These are aAbBcdHIjmMpSUwWxXyYZ%. But even then, the results of some of the conversion specifiers are non-portable.
aAbBcdHIjmMpSUwWxXyYZ%
[0.95_5] This implementation of strftime() is character-set aware, even when the LC_TIME table does not match the type of the format string.
strftime()
Returns the strings to be used to represent Standard time (STD) respectively Daylight Savings Time (DST).
tzset(); my ($std, $dst) = tzname;
Set-up local timezone from $ENV{TZ} and the OS.
$ENV{TZ}
The constant names for this module are inserted here during installation.
This module is part of POSIX-1003 distribution version 0.99_05, built on March 18, 2015. Website: http://perl.overmeer.net. The code is based on POSIX, which is released with Perl itself. See also POSIX::Util for additional functionality.
Copyrights 2011-2015 on the perl code and the related documentation by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html
To install POSIX::1003, copy and paste the appropriate command in to your terminal.
cpanm
cpanm POSIX::1003
CPAN shell
perl -MCPAN -e shell install POSIX::1003
For more information on module installation, please visit the detailed CPAN module installation guide.