perl – 为什么我的Time :: Piece代码给出了奇怪的结果？

我试图在Perl中对两个日期进行基本比较.当前日期时间和过去时间是正确的,但减法给出不正确的结果.差异应该是~24小时,但它返回~13小时.知道为什么以及如何解决它？谢谢.

use Time::Piece;

my $Now = Time::Piece->new;
my $then = Time::Piece->strptime("2014-04-14 16:30:20","%Y-%m-%d %H:%M:%s");
my $diff = $Now - $then;

print "Current time: $Now\n";
print "Past time: $then\n";
print "Diff in Seconds:",$diff,"\n";
print "Pretty Diff:",$diff->pretty,"\n";

Results
------
Current time: Tue Apr 15 16:13:39 2014
Past time: Mon Apr 14 16:30:20 2014
Diff in Seconds:49399
Pretty Diff:13 hours,43 minutes,19 seconds

解决方法

这两个时间点位于不同的时区.所以差异实际上是正确的.你可以看到

print $Now->tzoffset,"\n";    # 7200 (I am in UTC +2 hence have 7200s offset)
print $then->tzoffset,"\n";   # 0

所以基本上$then是UTC时间,而$Now现在是你的环境认为的时区.要解决这个问题,您需要决定所需的时区.