seconds into a date

Spooky has asked for the wisdom of the Perl Monks concerning the following question:

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Re: seconds into a date by davorg (Chancellor) on Jul 01, 2009 at 14:45 UTC
localtime takes a number of seconds since the epoch (usually 1st Jan 1970) and returns information about the date and time. For more complex requirements, I recommend looking at DateTime. `#!/usr/bin/perl use strict; use warnings; use DateTime; # 1st Jan 2000 my $date = DateTime->new(year => 2000, month => 1, day => 1); # Add a million seconds $date->add(seconds => 1_000_000); # See what you get - 2000-01-12T13:46:40 print $date;` [download] Update: Actually you can also do something similar using only modules from the standard distribution. `#!/usr/bin/perl use strict; use warnings; use Time::Local; # Warning: The parameters to timelocal can be a bit confusing # Read the documentation carefully my $date = timelocal(0, 0 , 0, 1, 0, 100); $date += 1_000_000; print scalar localtime $date;` [download] -- See the Copyright notice on my home node. Perl training courses	[reply] [d/l] [select]
Re^2: seconds into a date by Spooky (Beadle) on Jul 02, 2009 at 08:57 UTC
..thanks so much 'davorg' - your first response worked great and I'll try your update as well as look at DateTime although that looks like quite a bit of documentation... again, thanks....	[reply]
Re: seconds into a date by jrsimmon (Hermit) on Jul 01, 2009 at 14:50 UTC
By using the number of seconds since the epoch, you can use: `my (@date) = localtime($numSeconds);` [download] See the time and localtime data in perldoc.	[reply] [d/l]
Re: seconds into a date by toolic (Bishop) on Jul 01, 2009 at 15:30 UTC
Super Search where title contains all of "second", "date" ?node_id=3989;HIT=second%20date;re=N	[reply]
Re: seconds into a date by mzedeler (Pilgrim) on Jul 01, 2009 at 21:53 UTC
`localtime` and friends use UNIX time which is not a completely accurate measure of how many seconds has passed since 1970. It is very easy to use, but your results will be slightly off because of the way leap seconds are treated, see Unix time. I am not aware of any perl module that does positively treats leap seconds correctly.	[reply] [d/l]
Re^2: seconds into a date by afoken (Chancellor) on Jul 02, 2009 at 07:09 UTC
I am not aware of any perl module that does positively treats leap seconds correctly. DateTime seems to have proper leap second support, at least it has and uses a table of all leap seconds. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply]
Re^3: seconds into a date by Anonymous Monk on Jul 02, 2009 at 18:23 UTC
Be aware, however, that there is no implementation of leap seconds which can be valid for all jurisdictions. See an example in javascript here http://www.ucolick.org/~sla/leapsecs/epochtime.html	[reply]