如何使用Perl将纪元时间转换为UTC时间?
问题描述:
我需要使用Perl将历元日期和时间字符串转换为UTC日期和时间。如何使用Perl将纪元时间转换为UTC时间?
请分享您的想法。
#!/usr/bin/perl
my $start_time='1448841600';
my $stop_time='1448863200';
上述两个日期和时间是时代格式,应该转换为UTC日期和时间。
答
您可以使用gmtime
做转换,并且strftime
做格式化。
use POSIX 'strftime';
strftime "%d-%m-%Y-%H:%M:%S", gmtime('1448841600');
+2
协调通用时间(缩写为UTC,也称为格林威治标准时间或GMT)由[gmtime](http://perldoc.perl.org/functions/gmtime.html)返回。因此,不应使用'localtime',而应使用'gmtime'。 –
答
我建议使用Time::Piece
模块来操纵日期。
#!/usr/bin/env perl
use strict;
use warnings;
use Time::Piece;
my $start_time=Time::Piece -> new(1448841600);
print $start_time,"\n";
print $start_time -> epoch,"\n";
print $start_time -> strftime ("%Y-%m-%d %H:%M:%S"),"\n";
#nb - you can also use localtime/gmtime:
my $end_time = gmtime(1448863200);
print $end_time,"\n";
print $end_time->epoch,"\n";
你也可以做时区数学所列出的位置:How can I parse dates and convert time zones in Perl?
答
可以使用gmtime功能:
my $time = "1448841600";
my @months = ("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
my ($sec, $min, $hour, $day,$month,$year) = (gmtime($time))[0,1,2,3,4,5];
print "Time ".$time." converts to ".$months[$month]." ".$day.", ".($year+1900);
print " ".$hour.":".$min.":".$sec."\n";
输出:
Time 1448841600 converts to Nov 30, 2015 0:0:0
答
如果你需要做的更多在那些日期时间操作,use DateTime
use DateTime;
my $start_time ='1448841600';
my $stop_time ='1448863200';
my $start = DateTime->from_epoch(epoch=>$start_time)->set_time_zone('UTC');
my $stop = DateTime->from_epoch(epoch=>$stop_time)->set_time_zone('UTC');
say $start->strftime("%F %T %Z"); # 2015-11-30 00:00:00 UTC
say $stop->strftime("%F %T %Z"); # 2015-11-30 06:00:00 UTC
我的第一个想法是“为什么这些数字在引用的字符串?” :-) –