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Date Format regular expressions

cdoloriert

Hi there,

how can I convert Thu Aug 21 10:42:00 2008 to 08/21/08?
I know about Date::Manip, but it doesn't seem to be working properly. could you provide any samples or any other suggestions?

Thanks in advance.

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ISCBorisB

I know about Date::Manip, but it doesn't seem to be working properly

Date::Manip is perfectly fine. Chances are, it's your code that "doesn't seem to be working properly".

use Date::Manip;
BEGIN {$ENV{TZ} = 'US/Eastern' unless($ENV{TZ})};
print UnixDate(ParseDate('Thu Aug 21 10:42:00 2008'), '%m/%d/%y');

If you only know how many times I've heard something like "My code does not work. Must be a bug in
UNIX Kernel / GNU C++ Compiler / JBOSS Application Server / Einstein Relativity Theory, etc..."

cdoloriert

any other ways to deal with date conversions?

nipper

learn regex

jbonifaci

any other ways to deal with date conversions?


my %MonthToNumber =
(
 'Jan' => '01',
 'Feb' => '02',
 'Mar' => '03',
 'Apr' => '04',
 'May' => '05',
 'Jun' => '06',
 'Jul' => '07',
 'Aug' => '08',
 'Sep' => '09',
 'Oct' => '10',
 'Nov' => '11',
 'Dec' => '12'
);

my $date = 'Thu Aug 21 10:42:00 2008';

$date =~ s|\w+\s(\w+)\s(\d+)\s\d+:\d+:\d+\s(\d+)|sprintf('%2.2d/%2.2d/%4.4d',$MonthToNumber{$1},$2,$3)|e;

Hopefully this will help you down the road of learning regular expressions.

~Jeff

Migrateduser

There are a million ways to deal with strings in perl. Regex, packages, string manipulation, etc....

ISCBorisB

There are a million ways to deal with strings in perl. Regex, packages, string manipulation, etc....

True but what exactly does it have to do with this thread topic?

cdoloriert

What if I want to do the opposite? instead of converting Thu Aug 21 10:42:00 2008 to 08/21/08, do 08/21/08 to the other format.
I guess I will lose the time correct? because the time is not provided in that case.

Thanks

ISCBorisB

What if I want to do the opposite? instead of converting Thu Aug 21 10:42:00 2008 to 08/21/08, do 08/21/08 to the other format.
I guess I will lose the time correct? because the time is not provided in that case.

Thanks

Correct. You would have to either provide time from somewhere or hardcode it to something (try to avoid ambiguity of
a 00:00:00 sort). Another thing you are missing in that "reversal" is year. How would your code know if that 2008,
1908 or 1708 BC?

Adam Stoller

Correct. You would have to either provide time from somewhere or hardcode it to something (try to avoid ambiguity of
a 00:00:00 sort). Another thing you are missing in that "reversal" is year. How would your code know if that 2008,
1908 or 1708 BC?

... and if given a date of "08/07/08" - is that August 7th or July 8th (different sides of the pond...)

I generally prefer yyyy-mm-dd format - it's unambiguous and sorts lexically and chronologically the same (if you add time, use 24-hour time to maintain that functionality)