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How to comput the date

Posted on 2001-08-01
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Last Modified: 2013-12-25
I have a date string like this

dd/mm/yyyy

and i need to be able to do computations on it, such as is this date newer than this one

both dates are strings in the above format

how do i do this in perl
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Question by:kplonk
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4 Comments
 
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Accepted Solution

by:
bebonham earned 50 total points
ID: 6342987
#a non module idea for such specific strings
#note pretty, but pretty fast

###just to show it works
chomp($date=<STDIN>);  #for dates greater than 1999
chomp($futureDate=<STDIN>);
chomp($pastDate=<STDIN>);
print cmpDate($date,$futureDate);
print "\n" . cmpDate($date, $pastDate);
print "\n" . cmpDate($futureDate, $date);
####


###this is the real function

sub cmpDate  #returns 1 for 2nd arg is greater, == 0, < -1
{
my($a,$b)=@_;
my($daya,$montha,$yeara)=split('/', $a);
my($dayb,$monthb,$yearb)=split('/', $b);
if($yeara>$yearb){ return -1};
if($yeara<$yearb){ return 1};
if($montha>$monthb){ return -1};
if($montha<$monthb){ return 1};
if($daya>$dayb){ return -1};
if($daya<$dayb){ return 1};
return 0;  #careful, returns 0 on error as well.
}
######
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LVL 8

Expert Comment

by:bebonham
ID: 6342994
actually, no, since perl is so flexable, it will return the greatest

1/2/3

3 ranked highest
then 1
then 2

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LVL 84

Expert Comment

by:ozo
ID: 6343321
return $yeara <=> $yearb or $montha <=> $monthb or $daya <=> $dayb;

#or

return (join'',reverse split'/',$a) cmp (join'',reverse split'/',$b);
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Author Comment

by:kplonk
ID: 6346603
Just th job
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