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P5localtime - Implement Perl 5's localtime / gmtime built-ins
use P5localtime; # 0 1 2 3 4 5 6 7 8 my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time); say localtime(time, :scalar); my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = gmtime(time); say gmtime(time, :scalar);
This module tries to mimic the behaviour of the
gmtime functions of Perl 5 as closely as possible.
localtime EXPR localtime Converts a time as returned by the time function to a 9-element list with the time analyzed for the local time zone. Typically used as follows: # 0 1 2 3 4 5 6 7 8 ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time); All list elements are numeric and come straight out of the C `struct tm'. $sec, $min, and $hour are the seconds, minutes, and hours of the specified time. $mday is the day of the month and $mon the month in the range 0..11, with 0 indicating January and 11 indicating December. This makes it easy to get a month name from a list: my @abbr = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec); print "$abbr[$mon] $mday"; # $mon=9, $mday=18 gives "Oct 18" $year contains the number of years since 1900. To get a 4-digit year write: $year += 1900; To get the last two digits of the year (e.g., "01" in 2001) do: $year = sprintf("%02d", $year % 100); $wday is the day of the week, with 0 indicating Sunday and 3 indicating Wednesday. $yday is the day of the year, in the range 0..364 (or 0..365 in leap years.) $isdst is true if the specified time occurs during Daylight Saving Time, false otherwise. If EXPR is omitted, "localtime()" uses the current time (as returned by time(3)). In scalar context, "localtime()" returns the ctime(3) value: $now_string = localtime; # e.g., "Thu Oct 13 04:54:34 1994" The format of this scalar value is not locale-dependent but built into Perl. For GMT instead of local time use the "gmtime" builtin. See also the "Time::Local" module (for converting seconds, minutes, hours, and such back to the integer value returned by time()), and the POSIX module's strftime(3) and mktime(3) functions. To get somewhat similar but locale-dependent date strings, set up your locale environment variables appropriately (please see perllocale) and try for example: use POSIX qw(strftime); $now_string = strftime "%a %b %e %H:%M:%S %Y", localtime; # or for GMT formatted appropriately for your locale: $now_string = strftime "%a %b %e %H:%M:%S %Y", gmtime; Note that the %a and %b, the short forms of the day of the week and the month of the year, may not necessarily be three characters wide. The Time::gmtime and Time::localtime modules provide a convenient, by-name access mechanism to the gmtime() and localtime() functions, respectively. For a comprehensive date and time representation look at the DateTime module on CPAN. Portability issues: "localtime" in perlport. gmtime EXPR gmtime Works just like "localtime" but the returned values are localized for the standard Greenwich time zone. Note: When called in list context, $isdst, the last value returned by gmtime, is always 0. There is no Daylight Saving Time in GMT. Portability issues: "gmtime" in perlport.
Since Perl 6 does not have a concept of scalar context, this must be mimiced by passing the
:scalar named parameter.
The implementation actually also returns the offset in GMT in seconds as element number 9, and the name of the timezone as element number 10, if supported by the OS.
Elizabeth Mattijsen email@example.com
Source can be located at: https://github.com/lizmat/P5localtime . Comments and Pull Requests are welcome.
JJ Merelo, Jan-Olof Hendig, Tobias Leich, Timo Paulssen and Christoph (on StackOverflow) for support in getting this to work.
Copyright 2018 Elizabeth Mattijsen
Re-imagined from Perl 5 as part of the CPAN Butterfly Plan.
This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.